Johannes Hoffart

Research

My research interest is in Generative AI and Foundation Models on multiple modalities, with a focus on business data.

Talks

• Foundation Models on Linked Business Data. Keynote at WSDM 2025, Hannover, Mar 2025
• Foundation Models on Linked Business Data. Keynote at AutoML 24, Paris, Sep 2024
• Foundation Models x Linked Business Data. Invited talk at LMU Munich, May 2024
• Participated in panel discussion on Generative AI for companies: much attention, (too) many expectations? organised by PLS at Hannover Messe 2024, April 2024
• Foundation Models x Linked Business Data. Keynote at the Ellis Workshop on Semantic, Symbolic and Interpretable Machine Learning at MFO, February 2024
• How Large Language Models are impacting business applications today … and what’s still to come. Future of AI, May 2023
• Generative KI und ChatGPT – müssen wir nicht mehr (selbst) denken? Presentation in the series acatech am Dienstag, March 2023
• Rich Text, Lean Knowledge Bases: Knowledge Extraction from Financial Documents. Keynote at The AAAI-21 Workshop on Knowledge Discovery from Unstructured Data in Financial Services (AAAI-KDF), February 2021
• Executable Credit Agreements – Goldman Sachs R&D Core AI at the Virtual Heidelberg Laureate Forum.
  vHLF 2020, Heidelberg, Germany, September 2020
• NLP in the Financial Domain: Extra Dimensions for Natural Language Processing.
  SydneyNLP Meetup, Sydney, Australia, September 2020
• Natural Language Understanding and Knowledge Bases in Finance (and AI Research at Goldman Sachs).
  NEC Labs Heidelberg, Heidelberg, Germany, January 2020
• Riesige Mengen von Dokumenten besser durchsuchen und analysieren.
  Bundeszentralamt für Steuern, Bonn, Germany, February 2017
• Knowledge Bases for Web Content Analytics.
  Tutorial at the 24th International World Wide Web Conference, Florence, Italy, WWW 2015
• Discovering and Disambiguating Named Entities in Text.
  Fudan University, Shanghai, China. November 2014
• Discovering and Disambiguating Named Entities in Text.
  HPC Lab at ISTI, CNR, Pisa, Italy. October 2014
• Constructing a Spatio-Temporal Knowledge Base and using it to Process and Understand Natural Language Text.
  Seoul National University (invited by Saltlux), Seoul, South Korea. August 2013
• Robust Disambiguation of Named Entities in Text.
  Google Zurich, Switzerland. August 2011

Publications

2024

• Timotheus Kampik, Christian Warmuth, Adrian Rebmann, Ron Agam, Lukas N. P. Egger, Andreas Gerber, Johannes Hoffart, Jonas Kolk, Philipp Herzig, Gero Decker, Han van der Aa, Artem Polyvyanyy, Stefanie Rinderle-Ma, Ingo Weber, and Matthias Weidlich. Large process models: a vision for business process management in the age of generative ai. Ki – künstliche intelligenz, 2024.
  [Bibtex]

  @article{Kampik:2024aa,
  abstract = {The continued success of Large Language Models (LLMs) and other generative artificial intelligence approaches highlights the advantages that large information corpora can have over rigidly defined symbolic models, but also serves as a proof-point of the challenges that purely statistics-based approaches have in terms of safety and trustworthiness. As a framework for contextualizing the potential, as well as the limitations of LLMs and other foundation model-based technologies, we propose the concept of a Large Process Model (LPM) that combines the correlation power of LLMs with the analytical precision and reliability of knowledge-based systems and automated reasoning approaches. LPMs are envisioned to directly utilize the wealth of process management experience that experts have accumulated, as well as process performance data of organizations with diverse characteristics, e.g., regarding size, region, or industry. In this vision, the proposed LPM would enable organizations to receive context-specific (tailored) process and other business models, analytical deep-dives, and improvement recommendations. As such, it would allow to substantially decrease the time and effort required for business transformation, while also allowing for deeper, more impactful, and more actionable insights than previously possible. We argue that implementing an LPM is feasible, but also highlight limitations and research challenges that need to be solved to implement particular aspects of the LPM vision.},
  author = {Kampik, Timotheus and Warmuth, Christian and Rebmann, Adrian and Agam, Ron and Egger, Lukas N. P. and Gerber, Andreas and Hoffart, Johannes and Kolk, Jonas and Herzig, Philipp and Decker, Gero and van der Aa, Han and Polyvyanyy, Artem and Rinderle-Ma, Stefanie and Weber, Ingo and Weidlich, Matthias},
  date = {2024/07/26},
  date-added = {2024-09-08 14:58:27 +0200},
  date-modified = {2024-09-08 14:58:27 +0200},
  doi = {10.1007/s13218-024-00863-8},
  id = {Kampik2024},
  isbn = {1610-1987},
  journal = {KI - K{\"u}nstliche Intelligenz},
  title = {Large Process Models: A Vision for Business Process Management in the Age of Generative AI},
  url = {https://doi.org/10.1007/s13218-024-00863-8},
  year = {2024},
  bdsk-url-1 = {https://doi.org/10.1007/s13218-024-00863-8}}

2023

• Anson Bastos, Kuldeep Singh, Abhishek Nadgeri, Johannes Hoffart, Manish Singh, and Suzumura Toyotaro. Can persistent homology provide an efficient alternative for evaluation of knowledge graph completion methods?. In Proceedings of the acm web conference 2023, page 2455–2466, 2023.
  [Bibtex]

  @inproceedings{Bastos:2023,
  author = {Bastos, Anson and Singh, Kuldeep and Nadgeri, Abhishek and Hoffart, Johannes and Singh, Manish and Suzumura Toyotaro},
  booktitle = {Proceedings of the ACM Web Conference 2023},
  date-added = {2024-01-13 21:42:59 +0100},
  date-modified = {2024-01-13 21:45:06 +0100},
  pages = {2455--2466},
  title = {Can Persistent Homology provide an efficient alternative for Evaluation of Knowledge Graph Completion Methods?},
  year = {2023}}

2021

• Abhishek Nadgeri, Anson Bastos, Kuldeep Singh, Isaiah Onando Mulang, Johannes Hoffart, Saedeh Shekarpour, and Vijay Saraswat. KGPool: Dynamic Knowledge Graph Context Selection for Relation Extraction. In Findings of the association for computational linguistics: acl-ijcnlp 2021, page 535–548, 2021.
  [Bibtex]

  @inproceedings{Nadgeri:2021,
  author = {Nadgeri, Abhishek and Bastos, Anson and Singh, Kuldeep and Mulang, Isaiah Onando and Hoffart, Johannes and Shekarpour, Saedeh and Saraswat, Vijay},
  booktitle = {Findings of the Association for Computational Linguistics: ACL-IJCNLP 2021},
  date-added = {2021-11-11 17:17:00 +0100},
  date-modified = {2021-11-11 17:18:09 +0100},
  pages = {535--548},
  title = {{KGPool: Dynamic Knowledge Graph Context Selection for Relation Extraction}},
  year = {2021}}

• Anson Bastos, Kuldeep Singh, Abhishek Nadgeri, Saedeh Shekarpour, Isaiah Onando Mulang, and Johannes Hoffart. HopfE: Knowledge Graph Representation Learning using Inverse Hopf Fibrations. In Proceedings of the 30th acm international conference on information & knowledge management, cikm 2021, page 89–99, 2021.
  [Bibtex]

  @inproceedings{Bastos:2021b,
  author = {Bastos, Anson and Singh, Kuldeep and Nadgeri, Abhishek and Shekarpour, Saedeh and Mulang, Isaiah Onando and Hoffart, Johannes},
  booktitle = {Proceedings of the 30th ACM International Conference on Information & Knowledge Management, CIKM 2021},
  date-added = {2021-11-11 17:15:03 +0100},
  date-modified = {2021-11-11 17:16:10 +0100},
  pages = {89--99},
  title = {{HopfE: Knowledge Graph Representation Learning using Inverse Hopf Fibrations}},
  year = {2021}}

• Harsh Gupta, Luciano Del Corro, Samuel Broscheit, Johannes Hoffart, and Eliot Brenner. Unsupervised Multi-View Post-OCR Error Correction With Language Models. In Proceeedings of the 2021 conference on empirical methods in natural language, punta cana, dominican republic, 2021, page 8647–8652, 2021.
  [Bibtex]

  @inproceedings{Gupta:2021,
  author = {Gupta, Harsh and Del Corro, Luciano and Broscheit, Samuel and Hoffart, Johannes and Brenner, Eliot},
  booktitle = {Proceeedings of the 2021 Conference on Empirical Methods in Natural Language, Punta Cana, Dominican Republic, 2021},
  date-added = {2021-11-11 17:13:42 +0100},
  date-modified = {2021-11-11 17:16:37 +0100},
  pages = {8647--8652},
  title = {{Unsupervised Multi-View Post-OCR Error Correction With Language Models}},
  year = {2021}}

• Manoj Prabhakar Kannan Ravi, Kuldeep Singh, Isaiah Onando Mulang, Saedeh Shekarpour, Johannes Hoffart, and Jens Lehmann. CHOLAN: A Modular Approach for Neural Entity Linking on Wikipedia and Wikidata. In Proceedings of the 16th conference of the european chapter of the association for computational linguistics, eacl 2021, pages 504-514, 2021.
  [Bibtex]

  @inproceedings{Prabhakar:2021,
  author = {Ravi, Manoj Prabhakar Kannan and Singh, Kuldeep and Mulang, Isaiah Onando and Shekarpour, Saedeh and Hoffart, Johannes and Lehmann, Jens},
  booktitle = {Proceedings of the 16th Conference of the European Chapter of the Association for Computational Linguistics, EACL 2021},
  date-added = {2021-04-24 22:27:17 +0200},
  date-modified = {2021-05-29 16:26:12 +0200},
  pages = {504-514},
  title = {{CHOLAN: A Modular Approach for Neural Entity Linking on Wikipedia and Wikidata}},
  year = {2021}}

• Anson Bastos, Abhishek Nadgeri, Kuldeep Singh, Isaiah Onando Mulang, Saedeh Shekarpour, and Johannes Hoffart. RECON: Relation Extraction using Knowledge Graph Context in a Graph Neural Network. In Proceedings of the 30th the web conference, www 2021, 2021.
  [Bibtex]

  @inproceedings{Bastos:2021,
  author = {Bastos, Anson and Nadgeri, Abhishek and Singh, Kuldeep and Mulang, Isaiah Onando and Shekarpour, Saedeh and Hoffart, Johannes},
  booktitle = {Proceedings of the 30th The Web Conference, WWW 2021},
  date-added = {2021-04-24 22:21:23 +0200},
  date-modified = {2021-04-24 22:33:35 +0200},
  title = {{RECON: Relation Extraction using Knowledge Graph Context in a Graph Neural Network}},
  year = {2021}}

• Luciano Del Corro and Johannes Hoffart. From Stock Prediction to Financial Relevance: Repurposing Attention Weights to Assess News Relevance Without Manual Annotations. In Economics and natural language processing (econlp), workshop at the 2021 conference on empirical methods in natural language, punta cana, dominican republic, 2021, 2021.
  [Bibtex]

  @inproceedings{DelCorro:2020jb,
  author = {Del Corro, Luciano and Hoffart, Johannes},
  booktitle = {Economics and Natural Language Processing (ECONLP), Workshop at the 2021 Conference on Empirical Methods in Natural Language, Punta Cana, Dominican Republic, 2021},
  date-modified = {2021-11-11 17:13:28 +0100},
  title = {{From Stock Prediction to Financial Relevance: Repurposing Attention Weights to Assess News Relevance Without Manual Annotations}},
  year = {2021}}

2020

• Isaiah Onando Mulang, Kuldeep Singh, Chaitali Prabhu, Abhishek Nadgeri, Johannes Hoffart, and Jens Lehmann. Evaluating the Impact of Knowledge Graph Context on Entity Disambiguation Models. In Proceedings of the 29th acm international conference on information and knowledge management, cikm 2020, page 2157–2160, 2020.
  [Bibtex]

  @inproceedings{Mulang:2020jb,
  author = {Mulang, Isaiah Onando and Singh, Kuldeep and Prabhu, Chaitali and Nadgeri, Abhishek and Hoffart, Johannes and Lehmann, Jens},
  booktitle = {Proceedings of the 29th ACM International Conference on Information and Knowledge Management, CIKM 2020},
  date-modified = {2021-04-24 22:32:26 +0200},
  pages = {2157--2160},
  title = {{Evaluating the Impact of Knowledge Graph Context on Entity Disambiguation Models}},
  year = {2020}}

2019

• Gerhard Weikum, Johannes Hoffart, and Fabian M. Suchanek. Knowledge Harvesting: Achievements and Challenges. Computing and software science, 10000(1):217–235, 2019.
  [Bibtex]

  @article{Weikum:2019is,
  author = {Weikum, Gerhard and Hoffart, Johannes and Suchanek, Fabian M},
  journal = {Computing and Software Science},
  number = {1},
  pages = {217--235},
  title = {{Knowledge Harvesting: Achievements and Challenges}},
  volume = {10000},
  year = {2019}}

2018

• Christoph Balada, Alexandra Bellanova, Michael Bruss, Stefan Buchberger, Jan Cirullies, Luciano Del Corro, Reinhard Festag, Gregor Fuhs, Stephan Goetze, Thorsten Gressling, Maike Havemann, Johannes Hoffart, Stefan Holtel, Andreas Hufenstuhl, Wener Kraus, Norbert Pfleger, Yevgen Pikus, Robin Altran, Till Plumbaum, Gerhard Rolletschek, Lars Satow, Igor Schnakenburg, Ralph Siepmann, Rupert Steffner, Moritz Takaya Shozo, Matthias Weber, Sebastian Wieczorek, and Georg Wittenburg. Digitalisierung gestalten mit dem Periodensystem der Künstlichen Intelligenz. Technical Report, 2018.
  [Bibtex]

  @techreport{Balada:2018vn,
  author = {Balada, Christoph and Bellanova, Alexandra and Bruss, Michael and Buchberger, Stefan and Cirullies, Jan and Del Corro, Luciano and Festag, Reinhard and Fuhs, Gregor and Goetze, Stephan and Gressling, Thorsten and Havemann, Maike and Hoffart, Johannes and Holtel, Stefan and Hufenstuhl, Andreas and Kraus, Wener and Pfleger, Norbert and Pikus, Yevgen and Altran, Robin and Plumbaum, Till and Rolletschek, Gerhard and Satow, Lars and Schnakenburg, Igor and Siepmann, Ralph and Steffner, Rupert and Shozo, Moritz Takaya and Weber, Matthias and Wieczorek, Sebastian and Wittenburg, Georg},
  title = {{Digitalisierung gestalten mit dem Periodensystem der K{\"u}nstlichen Intelligenz}},
  year = {2018}}

• Prabal Agarwal, Jannik Strötgen, Luciano Del Corro, Johannes Hoffart, and Gerhard Weikum. diaNED: Time-Aware Named Entity Disambiguation for Diachronic Corpora. In Proceedings of the 56th annual meeting of the association for computational linguistics, melbourne, australia, acl 2018, page 686–693, 2018.
  [Bibtex]

  @inproceedings{Agarwal:2018tb,
  author = {Agarwal, Prabal and Str{\"o}tgen, Jannik and Del Corro, Luciano and Hoffart, Johannes and Weikum, Gerhard},
  booktitle = {Proceedings of the 56th Annual Meeting of the Association for Computational Linguistics, Melbourne, Australia, ACL 2018},
  pages = {686--693},
  title = {{diaNED: Time-Aware Named Entity Disambiguation for Diachronic Corpora}},
  year = {2018}}

• Dominic Seyler, Tatiana Dembelova, Luciano Del Corro, Johannes Hoffart, and Gerhard Weikum. A Study of the Importance of External Knowledge in the Named Entity Recognition Task. In Proceedings of the 56th annual meeting of the association for computational linguistics, acl 2018, melbourne, australia, page 241–246, 2018.
  [Bibtex]

  @inproceedings{Seyler:2018vc,
  author = {Seyler, Dominic and Dembelova, Tatiana and Del Corro, Luciano and Hoffart, Johannes and Weikum, Gerhard},
  booktitle = {Proceedings of the 56th Annual Meeting of the Association for Computational Linguistics, ACL 2018, Melbourne, Australia},
  pages = {241--246},
  title = {{A Study of the Importance of External Knowledge in the Named Entity Recognition Task}},
  year = {2018}}

2017

• Dominic Seyler, Tatiana Dembelova, Luciano Del Corro, Johannes Hoffart, and Gerhard Weikum. KnowNER – Incremental Multilingual Knowledge in Named Entity Recognition. Corr, cs.CL, 2017.
  [Bibtex]

  @article{Seyler:2017ww,
  author = {Seyler, Dominic and Dembelova, Tatiana and Del Corro, Luciano and Hoffart, Johannes and Weikum, Gerhard},
  journal = {CoRR},
  title = {{KnowNER - Incremental Multilingual Knowledge in Named Entity Recognition}},
  volume = {cs.CL},
  year = {2017}}

2016

• Thomas Rebele, Fabian M. Suchanek, Johannes Hoffart, Joanna Biega, Erdal Kuzey, and Gerhard Weikum. YAGO – A Multilingual Knowledge Base from Wikipedia, Wordnet, and Geonames.. In Proceedings of the 15th international semantic web conference, iswc 2016, page 177–185, Cham, 2016. Springer international publishing.
  [Bibtex]

  @inproceedings{Rebele:2016vx,
  address = {Cham},
  author = {Rebele, Thomas and Suchanek, Fabian M and Hoffart, Johannes and Biega, Joanna and Kuzey, Erdal and Weikum, Gerhard},
  booktitle = {Proceedings of the 15th International Semantic Web Conference, ISWC 2016},
  pages = {177--185},
  publisher = {Springer International Publishing},
  title = {{YAGO - A Multilingual Knowledge Base from Wikipedia, Wordnet, and Geonames.}},
  year = {2016}}

• Johannes Hoffart, Dragan Milchevski, Gerhard Weikum, Avishek Anand, and Jaspreet Singh. The Knowledge Awakens: Keeping Knowledge Bases Fresh with Emerging Entities. In Proceedings of the 25th international conference companion on world wide web, www 2016, montreal, canada, page 203–206. International world wide web conferences steering committee, 2016.
  [Bibtex]

  @inproceedings{Hoffart:2016bp,
  author = {Hoffart, Johannes and Milchevski, Dragan and Weikum, Gerhard and Anand, Avishek and Singh, Jaspreet},
  booktitle = {Proceedings of the 25th International Conference Companion on World Wide Web, WWW 2016, Montreal, Canada},
  month = apr,
  pages = {203--206},
  publisher = {International World Wide Web Conferences Steering Committee},
  title = {{The Knowledge Awakens: Keeping Knowledge Bases Fresh with Emerging Entities}},
  year = {2016}}

• Gerhard Weikum, Johannes Hoffart, and Fabian Suchanek. Ten Years of Knowledge Harvesting: Lessons and Challenges. Ieee data eng. bull., 39(3):41–50, 2016.
  [Bibtex]

  @article{Weikum:2016vn,
  author = {Weikum, Gerhard and Hoffart, Johannes and Suchanek, Fabian},
  journal = {IEEE Data Eng. Bull.},
  number = {3},
  pages = {41--50},
  title = {{Ten Years of Knowledge Harvesting: Lessons and Challenges}},
  volume = {39},
  year = {2016}}

• Andreas Schmidt, Johannes Hoffart, Dragan Milchevski, and Gerhard Weikum. Context-Sensitive Auto-Completion for Searching with Entities and Categories. In Proceedings of the 39th international acm sigir conference on research and development in information retrieval – systems demonstrations, page 1097–1100. Acm press, 2016.
  [Bibtex]

  @inproceedings{Schmidt:2016kr,
  author = {Schmidt, Andreas and Hoffart, Johannes and Milchevski, Dragan and Weikum, Gerhard},
  booktitle = {Proceedings of the 39th International ACM SIGIR conference on Research and Development in Information Retrieval - Systems Demonstrations},
  pages = {1097--1100},
  publisher = {ACM Press},
  title = {{Context-Sensitive Auto-Completion for Searching with Entities and Categories}},
  year = {2016}}

• Patrick Ernst, Amy Siu, Dragan Milchevski, Johannes Hoffart, and Gerhard Weikum. DeepLife: An Entity-aware Search, Analytics and Exploration Platform for Health and Life Sciences. In Proceedings of the 54th annual meeting of the association for computational linguistics – system demonstrations, page 19–24, 2016.
  [Bibtex]

  @inproceedings{Ernst:uv,
  author = {Ernst, Patrick and Siu, Amy and Milchevski, Dragan and Hoffart, Johannes and Weikum, Gerhard},
  booktitle = {Proceedings of the 54th Annual Meeting of the Association for Computational Linguistics - System Demonstrations},
  pages = {19--24},
  title = {{DeepLife: An Entity-aware Search, Analytics and Exploration Platform for Health and Life Sciences}},
  year = {2016}}

• Jaspreet Singh, Johannes Hoffart, and Avishek Anand. Discovering Entities with Just a Little Help from You. In Proceedings of the 25th acm international on conference on information and knowledge management, cikm 2016, indianapolis, usa, page 1331–1340. Acm press, 2016.
  [Bibtex]

  @inproceedings{Singh:2016du,
  author = {Singh, Jaspreet and Hoffart, Johannes and Anand, Avishek},
  booktitle = {Proceedings of the 25th ACM International on Conference on Information and Knowledge Management, CIKM 2016, Indianapolis, USA},
  pages = {1331--1340},
  publisher = {ACM Press},
  title = {{Discovering Entities with Just a Little Help from You}},
  year = {2016}}

2015

• Johannes Hoffart. Discovering and Disambiguating Named Entities in Text. PhD thesis, 2015.
  [Bibtex]

  @phdthesis{Hoffart:2015wk,
  author = {Hoffart, Johannes},
  month = feb,
  title = {{Discovering and Disambiguating Named Entities in Text}},
  year = {2015}}

• Johannes Hoffart, Nicoleta Preda, Fabian M. Suchanek, and Gerhard Weikum. Knowledge Bases for Web Content Analytics. In Tutorial at www 2015, florence, italy, page 1–1, 2015.
  [Bibtex]

  @inproceedings{Hoffart:2015dr,
  author = {Hoffart, Johannes and Preda, Nicoleta and Suchanek, Fabian M and Weikum, Gerhard},
  booktitle = {Tutorial at WWW 2015, Florence, Italy},
  pages = {1--1},
  title = {{Knowledge Bases for Web Content Analytics}},
  year = {2015}}

2014

• Johannes Hoffart, Dragan Milchevski, and Gerhard Weikum. STICS: Searching with Strings, Things, and Cats. In The 37th international acm sigir conference on research and development in information retrieval, sigir 2014, gold coast, qld, australia, page 1247–1248, 2014.
  [Bibtex]

  @inproceedings{Hoffart:2014dt,
  author = {Hoffart, Johannes and Milchevski, Dragan and Weikum, Gerhard},
  booktitle = {The 37th International ACM SIGIR Conference on Research and Development in Information Retrieval, SIGIR 2014, Gold Coast, QLD, Australia},
  pages = {1247--1248},
  title = {{STICS: Searching with Strings, Things, and Cats}},
  year = {2014}}

• Johannes Hoffart, Dragan Milchevski, and Gerhard Weikum. AESTHETICS: Analytics with Strings, Things, and Cats. In Proceedings of the 23rd acm international conference on conference on information and knowledge management, cikm 2014, shanghai, china, 2014.
  [Bibtex]

  @inproceedings{Hoffart:2014cy,
  author = {Hoffart, Johannes and Milchevski, Dragan and Weikum, Gerhard},
  booktitle = {Proceedings of the 23rd ACM International Conference on Conference on Information and Knowledge Management, CIKM 2014, Shanghai, China},
  title = {{AESTHETICS: Analytics with Strings, Things, and Cats}},
  year = {2014}}

• Dat Ba Nguyen, Johannes Hoffart, Martin Theobald, and Gerhard Weikum. AIDA-light: High-Throughput Named-Entity Disambiguation. In Linked data on the web at www2014, 2014.
  [Bibtex]

  @inproceedings{Nguyen:2014wl,
  author = {Nguyen, Dat Ba and Hoffart, Johannes and Theobald, Martin and Weikum, Gerhard},
  booktitle = {Linked Data on the Web at WWW2014},
  title = {{AIDA-light: High-Throughput Named-Entity Disambiguation}},
  year = {2014}}

• Johannes Hoffart, Yasemin Altun, and Gerhard Weikum. Discovering emerging entities with ambiguous names. In Proceedings of the 23rd international conference on world wide web, www 2014, seoul, south korea, page 385–396, 2014.
  [Bibtex]

  @inproceedings{Hoffart:2014hp,
  author = {Hoffart, Johannes and Altun, Yasemin and Weikum, Gerhard},
  booktitle = {Proceedings of the 23rd international conference on World wide web, WWW 2014, Seoul, South Korea},
  pages = {385--396},
  title = {{Discovering emerging entities with ambiguous names}},
  year = {2014}}

2013

• Stephan Seufert, Srikanta J. Bedathur, Johannes Hoffart, Andrey Gubichev, and Klaus Berberich. Efficient Computation of Relationship-Centrality in Large Entity-Relationship Graphs. In Posters and demonstrations track of the 12th international semantic web conference, iswc 2013, sydney, australia, page 1–4, 2013.
  [Bibtex]

  @inproceedings{Seufert:2013tx,
  author = {Seufert, Stephan and Bedathur, Srikanta J and Hoffart, Johannes and Gubichev, Andrey and Berberich, Klaus},
  booktitle = {Posters and Demonstrations Track of the 12th International Semantic Web Conference, ISWC 2013, Sydney, Australia},
  pages = {1--4},
  title = {{Efficient Computation of Relationship-Centrality in Large Entity-Relationship Graphs}},
  year = {2013}}

• Yafang Wang, Lili Jian, Johannes Hoffart, and Gerhard Weikum. YaLi: a Crowdsourcing Plug-In for NERD. In Sigir 2013, dublin, ireland, 2013.
  [Bibtex]

  @inproceedings{Wang:2013wx,
  author = {Wang, Yafang and Jian, Lili and Hoffart, Johannes and Weikum, Gerhard},
  booktitle = {SIGIR 2013, Dublin, Ireland},
  title = {{YaLi: a Crowdsourcing Plug-In for NERD}},
  year = {2013}}

• Mohamed Amir Yosef, Sandro Bauer, Johannes Hoffart, Marc Spaniol, and Gerhard Weikum. HYENA-live: Fine-Grained Online Entity Type Classification from Natural-language Text. In Proceedings of the 51st annual meeting of the association for computational linguistics, acl 2013, sofia, bulgaria, page 133–138, 2013.
  [Bibtex]

  @inproceedings{Yosef:2013vb,
  author = {Yosef, Mohamed Amir and Bauer, Sandro and Hoffart, Johannes and Spaniol, Marc and Weikum, Gerhard},
  booktitle = {Proceedings of the 51st Annual Meeting of the Association for Computational Linguistics, ACL 2013, Sofia, Bulgaria},
  pages = {133--138},
  title = {{HYENA-live: Fine-Grained Online Entity Type Classification from Natural-language Text}},
  year = {2013}}

• Lili Jiang, Yafang Wang, Johannes Hoffart, and Gerhard Weikum. Crowdsourced Entity Markup. In Crowdsem workshop at the 12th international semantic web conference, iswc 2013, sydney, australia, 2013.
  [Bibtex]

  @inproceedings{Jiang:2013tw,
  author = {Jiang, Lili and Wang, Yafang and Hoffart, Johannes and Weikum, Gerhard},
  booktitle = {CrowdSem Workshop at the 12th International Semantic Web Conference, ISWC 2013, Sydney, Australia},
  title = {{Crowdsourced Entity Markup}},
  year = {2013}}

• Johannes Hoffart. Discovering and Disambiguating Named Entities in Text. In Phd symposion at acm sigmod international conference on management of data, sigmod 2013, new york city, usa, page 43–48, 2013.
  [Bibtex]

  @inproceedings{Hoffart:2013wk,
  author = {Hoffart, Johannes},
  booktitle = {PhD Symposion at ACM SIGMOD International Conference on Management of Data, SIGMOD 2013, New York City, USA},
  pages = {43--48},
  title = {{Discovering and Disambiguating Named Entities in Text}},
  year = {2013}}

• Fabian M. Suchanek, Johannes Hoffart, Erdal Kuzey, and Edwin Lewis-Kelham. YAGO2s: Modular High-Quality Information Extraction with an Application to Flight Planning. In 15. gi-fachtagung datenbanksysteme für business, technologie und web, 2013.
  [Bibtex]

  @inproceedings{Suchanek:2013vd,
  author = {Suchanek, Fabian M and Hoffart, Johannes and Kuzey, Erdal and Lewis-Kelham, Edwin},
  booktitle = {15. GI-Fachtagung Datenbanksysteme f{\"u}r Business, Technologie und Web},
  title = {{YAGO2s: Modular High-Quality Information Extraction with an Application to Flight Planning}},
  year = {2013}}

• Johannes Hoffart, Fabian M. Suchanek, Klaus Berberich, and Gerhard Weikum. YAGO2: A Spatially and Temporally Enhanced Knowledge Base from Wikipedia: Extended Abstract. In 23rd international joint conference on artificial intelligence, ijcai 2013, beijing, china, page 3161–3165, 2013.
  [Bibtex]

  @inproceedings{Hoffart:2013ww,
  author = {Hoffart, Johannes and Suchanek, Fabian M and Berberich, Klaus and Weikum, Gerhard},
  booktitle = {23rd International Joint Conference on Artificial Intelligence, IJCAI 2013, Beijing, China},
  pages = {3161--3165},
  title = {{YAGO2: A Spatially and Temporally Enhanced Knowledge Base from Wikipedia: Extended Abstract}},
  year = {2013}}

• Johannes Hoffart, Fabian M. Suchanek, Klaus Berberich, and Gerhard Weikum. YAGO2: A spatially and temporally enhanced knowledge base from Wikipedia. Artificial intelligence, 194:28–61, 2013.
  [Bibtex]

  @article{Hoffart:2013hn,
  author = {Hoffart, Johannes and Suchanek, Fabian M and Berberich, Klaus and Weikum, Gerhard},
  journal = {Artificial Intelligence},
  month = jan,
  pages = {28--61},
  title = {{YAGO2: A spatially and temporally enhanced knowledge base from Wikipedia}},
  volume = {194},
  year = {2013}}

2012

• Mohamed Amir Yosef, Sandro Bauer, Johannes Hoffart, Marc Spaniol, and Gerhard Weikum. HYENA: Hierarchical Type Classification for Entity Names. In Proceedings of the 24th international conference on computational linguistics, coling 2012, mumbai, india, page 1361–1370, 2012.
  [Bibtex]

  @inproceedings{Yosef:2012tz,
  author = {Yosef, Mohamed Amir and Bauer, Sandro and Hoffart, Johannes and Spaniol, Marc and Weikum, Gerhard},
  booktitle = {Proceedings of the 24th International Conference on Computational Linguistics, Coling 2012, Mumbai, India},
  pages = {1361--1370},
  title = {{HYENA: Hierarchical Type Classification for Entity Names}},
  year = {2012}}

• Johannes Hoffart, Stephan Seufert, Dat Ba Nguyen, Martin Theobald, and Gerhard Weikum. KORE: Keyphrase Overlap Relatedness for Entity Disambiguation. In Proceedings of the 21st acm international conference on information and knowledge management, cikm 2012, hawaii, usa, page 545–554, 2012.
  [Bibtex]

  @inproceedings{Hoffart:2012vx,
  author = {Hoffart, Johannes and Seufert, Stephan and Nguyen, Dat Ba and Theobald, Martin and Weikum, Gerhard},
  booktitle = {Proceedings of the 21st ACM International Conference on Information and Knowledge Management, CIKM 2012, Hawaii, USA},
  pages = {545--554},
  title = {{KORE: Keyphrase Overlap Relatedness for Entity Disambiguation}},
  year = {2012}}

• Gerhard Weikum, Johannes Hoffart, Ndapandula Nakashole, Marc Spaniol, Fabian Suchanek, and Mohamed Amir Yosef. Big Data Methods for Computational Linguistics. Ieee data eng. bull., 35:46–55, 2012.
  [Bibtex]

  @article{Weikum:2012wb,
  author = {Weikum, Gerhard and Hoffart, Johannes and Nakashole, Ndapandula and Spaniol, Marc and Suchanek, Fabian and Yosef, Mohamed Amir},
  journal = {IEEE Data Eng. Bull.},
  pages = {46--55},
  title = {{Big Data Methods for Computational Linguistics}},
  volume = {35},
  year = {2012}}

2011

• Johannes Hoffart, Mohamed Amir Yosef, Ilaria Bordino, Hagen Fürstenau, Manfred Pinkal, Marc Spaniol, Bilyana Taneva, Stefan Thater, and Gerhard Weikum. Robust Disambiguation of Named Entities in Text. In Proceedings of the 2011 conference on empirical methods in natural language processing, emnlp 2011, edinburgh, scotland, page 782–792, 2011.
  [Bibtex]

  @inproceedings{Hoffart:2011a,
  author = {Hoffart, Johannes and Yosef, Mohamed Amir and Bordino, Ilaria and F{\"u}rstenau, Hagen and Pinkal, Manfred and Spaniol, Marc and Taneva, Bilyana and Thater, Stefan and Weikum, Gerhard},
  booktitle = {Proceedings of the 2011 Conference on Empirical Methods in Natural Language Processing, EMNLP 2011, Edinburgh, Scotland},
  pages = {782--792},
  title = {{Robust Disambiguation of Named Entities in Text}},
  year = {2011}}

• Johannes Hoffart, Fabian M. Suchanek, Klaus Berberich, Edwin Lewis-Kelham, Gerard de Melo, and Gerhard Weikum. YAGO2: Exploring and Querying World Knowledge in Space, Context, and Many Languages. In Proceedings of the 20th international conference companion on world wide web, www 2011, hyderabad, india, page 229–232. Acm, 2011.
  [Bibtex]

  @inproceedings{Hoffart:2011,
  author = {Hoffart, Johannes and Suchanek, Fabian M and Berberich, Klaus and Lewis-Kelham, Edwin and de Melo, Gerard and Weikum, Gerhard},
  booktitle = {Proceedings of the 20th International Conference Companion on World Wide Web, WWW 2011, Hyderabad, India},
  pages = {229--232},
  publisher = {ACM},
  title = {{YAGO2: Exploring and Querying World Knowledge in Space, Context, and Many Languages}},
  year = {2011}}

• Mohamed Amir Yosef, Johannes Hoffart, Ilaria Bordino, Marc Spaniol, and Gerhard Weikum. AIDA: An Online Tool for Accurate Disambiguation of Named Entities in Text and Tables. In Proceedings of the 37th international conference on very large databases, vldb 2011, seattle, wa, usa, page 1450–1453, 2011.
  [Bibtex]

  @inproceedings{Yosef:2011,
  author = {Yosef, Mohamed Amir and Hoffart, Johannes and Bordino, Ilaria and Spaniol, Marc and Weikum, Gerhard},
  booktitle = {Proceedings of the 37th International Conference on Very Large Databases, VLDB 2011, Seattle, WA, USA},
  pages = {1450--1453},
  title = {{AIDA: An Online Tool for Accurate Disambiguation of Named Entities in Text and Tables}},
  year = {2011}}

2010

• Johannes Hoffart, Fabian M. Suchanek, Klaus Berberich, and Gerhard Weikum. YAGO2: A Spatially and Temporally Enhanced Knowledge Base from Wikipedia. Technical Report, Saarbrücken, Germany, 2010.
  [Bibtex]

  @techreport{Hoffart:2010,
  address = {Saarbr{\"u}cken, Germany},
  author = {Hoffart, Johannes and Suchanek, Fabian M and Berberich, Klaus and Weikum, Gerhard},
  month = nov,
  title = {{YAGO2: A Spatially and Temporally Enhanced Knowledge Base from Wikipedia}},
  year = {2010}}

2009

• Johannes Hoffart, Torsten Zesch, and Iryna Gurevych. An Architecture to Support Intelligent User Interfaces for Wikis by Means of Natural Language Processing. In Proceedings of the 5th international symposium on wikis and open collaboration, wikisym 2009, orlando, fl, usa. Acm, 2009.
  [Bibtex]

  @inproceedings{Hoffart:2009,
  author = {Hoffart, Johannes and Zesch, Torsten and Gurevych, Iryna},
  booktitle = {Proceedings of the 5th International Symposium on Wikis and Open Collaboration, WikiSym 2009, Orlando, FL, USA},
  month = oct,
  publisher = {ACM},
  title = {{An Architecture to Support Intelligent User Interfaces for Wikis by Means of Natural Language Processing}},
  year = {2009}}

• Johannes Hoffart, Daniel Bär, Torsten Zesch, and Iryna Gurevych. Discovering Links Using Semantic Relatedness. In Inex 2009 workshop preproceedings, 2009, brisbane, australia, page 314–325, 2009.
  [Bibtex]

  @inproceedings{Hoffart:2009a,
  author = {Hoffart, Johannes and B{\"a}r, Daniel and Zesch, Torsten and Gurevych, Iryna},
  booktitle = {INEX 2009 Workshop Preproceedings, 2009, Brisbane, Australia},
  pages = {314--325},
  title = {{Discovering Links Using Semantic Relatedness}},
  year = {2009}}

Reviewing

• Reviewer for IEEE Transactions on Knowledge and Data Engineering
• Reviewer for Elsevier Information Systems
• Reviewer for Journal of Web Semantics
• Reviewer for Computational Linguistics

• 2020
  • PC member of the 16th Conference of the European Chapter
    of the Association for Computational Linguistics, EACL 2021
  • PC member of the 58th Annual Meeting of the Association for Computational Linguistics, ACL 2020
  • PC member of the 2020 Conference on Empirical Methods in Natural Language Processing, EMNLP 2020
• 2019
  • PC member of the The Thirty-Fourth AAAI Conference on Artificial Intelligence, AAAI 2020
  • PC member of the 57th Annual Meeting of the Association for Computational Linguistics, ACL 2019
  • PC member of the 2019 Conference on Empirical Methods in Natural Language Processing and 9th International Joint Conference on Natural Language Processing, EMNLP-IJCNLP 2019
• 2018
  • PC member of the 56th Annual Meeting of the Association for Computational Linguistics, ACL 2018
  • PC member of the Second Workshop on Knowledge Graphs and Semantics for Text Retrieval, Analysis, and Understanding (KG4IR) at SIGIR 2018
• 2016
  • PC member of the 26th International World Wide Web Conference, WWW 2017 – **Outstanding Reviewer Award**
• 2015
  • PC member of the 53rd Annual Meeting of the Association for Computational Linguistics and the 7th International Joint Conference on Natural Language Processing of the Asian Federation of Natural Language Processing, ACL-IJCNLP 2015
• 2014
  • PC member of the Conference on Empirical Methods in Natural Language Processing, EMNLP 2014
  • PC member of the 25th International Conference on Computational Linguistics, COLING 2014
  • PC member of the 52nd Annual Meeting of the Association for Computational Linguistics, ACL 2014
  • PC member of the 14th Conference of the European Chapter of the Association for Computational Linguistics, EACL 2014
• 2013
  • PC member of the 51st Annual Meeting of the Association for Computational Linguistics, ACL 2013
• 2012
  • August – October 2012: Internship at Google Research in Zürich.
  • Reviewer of the Springer book ‘The People’s Web Meets NLP: Collaboratively Constructed Language Resources’
• 2011
  • PC member of the 1st International Workshop on Exploiting Large Knowledge Repositories