Johannes Hoffart

Research

My research interest is in natural language understanding and knowledge base construction, in the Web and in finance.

Invited Talks & Tutorials

• Rich Text, Lean Knowledge Bases: Knowledge Extraction from Financial Documents. Keynote at the 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

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, New York, NY, USA, 2020. Acm.
  [Bibtex]

  @inproceedings{Mulang:2020jb,
  author = {Mulang, Isaiah Onando and Singh, Kuldeep and Prabhu, Chaitali and Nadgeri, Abhishek and Hoffart, Johannes and Lehmann, Jens},
  title = {{Evaluating the Impact of Knowledge Graph Context on Entity Disambiguation Models}},
  booktitle = {Proceedings of the 29th ACM International Conference on Information and Knowledge Management, CIKM 2020},
  year = {2020},
  pages = {2157--2160},
  publisher = {ACM},
  address = {New York, NY, USA}
  }

• Luciano Del Corro and Johannes Hoffart. Unsupervised Extraction of Market Moving Events with Neural Attention.. Corr, cs.CL:2157–2160, 2020.
  [Bibtex]

  @article{DelCorro:2020jb,
  author = {Del Corro, Luciano and Hoffart, Johannes},
  title = {{Unsupervised Extraction of Market Moving Events with Neural Attention.}},
  journal = {CoRR},
  year = {2020},
  volume = {cs.CL},
  pages = {2157--2160}
  }

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},
  title = {{Knowledge Harvesting: Achievements and Challenges}},
  journal = {Computing and Software Science},
  year = {2019},
  volume = {10000},
  number = {1},
  pages = {217--235}
  }

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},
  title = {{diaNED: Time-Aware Named Entity Disambiguation for Diachronic Corpora}},
  booktitle = {Proceedings of the 56th Annual Meeting of the Association for Computational Linguistics, Melbourne, Australia, ACL 2018},
  year = {2018},
  pages = {686--693}
  }

• 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},
  title = {{A Study of the Importance of External Knowledge in the Named Entity Recognition Task}},
  booktitle = {Proceedings of the 56th Annual Meeting of the Association for Computational Linguistics, ACL 2018, Melbourne, Australia},
  year = {2018},
  pages = {241--246}
  }

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},
  title = {{KnowNER - Incremental Multilingual Knowledge in Named Entity Recognition}},
  journal = {CoRR},
  year = {2017},
  volume = {cs.CL}
  }

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

• 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},
  title = {{The Knowledge Awakens: Keeping Knowledge Bases Fresh with Emerging Entities}},
  booktitle = {Proceedings of the 25th International Conference Companion on World Wide Web, WWW 2016, Montreal, Canada},
  year = {2016},
  pages = {203--206},
  publisher = {International World Wide Web Conferences Steering Committee},
  month = apr
  }

• 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},
  title = {{Ten Years of Knowledge Harvesting: Lessons and Challenges}},
  journal = {IEEE Data Eng. Bull.},
  year = {2016},
  volume = {39},
  number = {3},
  pages = {41--50}
  }

• 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},
  title = {{Context-Sensitive Auto-Completion for Searching with Entities and Categories}},
  booktitle = {Proceedings of the 39th International ACM SIGIR conference on Research and Development in Information Retrieval - Systems Demonstrations},
  year = {2016},
  pages = {1097--1100},
  publisher = {ACM Press}
  }

• 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},
  title = {{DeepLife: An Entity-aware Search, Analytics and Exploration Platform for Health and Life Sciences}},
  booktitle = {Proceedings of the 54th Annual Meeting of the Association for Computational Linguistics - System Demonstrations},
  year = {2016},
  pages = {19--24}
  }

• 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},
  title = {{Discovering Entities with Just a Little Help from You}},
  booktitle = {Proceedings of the 25th ACM International on Conference on Information and Knowledge Management, CIKM 2016, Indianapolis, USA},
  year = {2016},
  pages = {1331--1340},
  publisher = {ACM Press}
  }

2015

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

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

• 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},
  title = {{Knowledge Bases for Web Content Analytics}},
  booktitle = {Tutorial at WWW 2015, Florence, Italy},
  year = {2015},
  pages = {1--1}
  }

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},
  title = {{STICS: Searching with Strings, Things, and Cats}},
  booktitle = {The 37th International ACM SIGIR Conference on Research and Development in Information Retrieval, SIGIR 2014, Gold Coast, QLD, Australia},
  year = {2014},
  pages = {1247--1248}
  }

• 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},
  title = {{AESTHETICS: Analytics with Strings, Things, and Cats}},
  booktitle = {Proceedings of the 23rd ACM International Conference on Conference on Information and Knowledge Management, CIKM 2014, Shanghai, China},
  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},
  title = {{AIDA-light: High-Throughput Named-Entity Disambiguation}},
  booktitle = {Linked Data on the Web at WWW2014},
  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},
  title = {{Discovering emerging entities with ambiguous names}},
  booktitle = {Proceedings of the 23rd international conference on World wide web, WWW 2014, Seoul, South Korea},
  year = {2014},
  pages = {385--396}
  }

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},
  title = {{Efficient Computation of Relationship-Centrality in Large Entity-Relationship Graphs}},
  booktitle = {Posters and Demonstrations Track of the 12th International Semantic Web Conference, ISWC 2013, Sydney, Australia},
  year = {2013},
  pages = {1--4}
  }

• 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},
  title = {{YaLi: a Crowdsourcing Plug-In for NERD}},
  booktitle = {SIGIR 2013, Dublin, Ireland},
  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},
  title = {{HYENA-live: Fine-Grained Online Entity Type Classification from Natural-language Text}},
  booktitle = {Proceedings of the 51st Annual Meeting of the Association for Computational Linguistics, ACL 2013, Sofia, Bulgaria},
  year = {2013},
  pages = {133--138}
  }

• 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},
  title = {{Crowdsourced Entity Markup}},
  booktitle = {CrowdSem Workshop at the 12th International Semantic Web Conference, ISWC 2013, Sydney, Australia},
  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},
  title = {{Discovering and Disambiguating Named Entities in Text}},
  booktitle = {PhD Symposion at ACM SIGMOD International Conference on Management of Data, SIGMOD 2013, New York City, USA},
  year = {2013},
  pages = {43--48}
  }

• 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},
  title = {{YAGO2s: Modular High-Quality Information Extraction with an Application to Flight Planning}},
  booktitle = {15. GI-Fachtagung Datenbanksysteme f{\"u}r Business,
  Technologie und Web},
  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},
  title = {{YAGO2: A Spatially and Temporally Enhanced Knowledge Base from Wikipedia: Extended Abstract}},
  booktitle = {23rd International Joint Conference on Artificial Intelligence, IJCAI 2013, Beijing, China},
  year = {2013},
  pages = {3161--3165}
  }

• 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},
  title = {{YAGO2: A spatially and temporally enhanced knowledge base from Wikipedia}},
  journal = {Artificial Intelligence},
  year = {2013},
  volume = {194},
  pages = {28--61},
  month = jan
  }

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},
  title = {{HYENA: Hierarchical Type Classification for Entity Names}},
  booktitle = {Proceedings of the 24th International Conference on Computational Linguistics, Coling 2012, Mumbai, India},
  year = {2012},
  pages = {1361--1370}
  }

• 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},
  title = {{KORE: Keyphrase Overlap Relatedness for Entity Disambiguation}},
  booktitle = {Proceedings of the 21st ACM International Conference on Information and Knowledge Management, CIKM 2012, Hawaii, USA},
  year = {2012},
  pages = {545--554}
  }

• 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},
  title = {{Big Data Methods for Computational Linguistics}},
  journal = {IEEE Data Eng. Bull.},
  year = {2012},
  volume = {35},
  pages = {46--55}
  }

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},
  title = {{Robust Disambiguation of Named Entities in Text}},
  booktitle = {Proceedings of the 2011 Conference on Empirical Methods in Natural Language Processing, EMNLP 2011, Edinburgh, Scotland},
  year = {2011},
  pages = {782--792}
  }

• 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},
  title = {{YAGO2: Exploring and Querying World Knowledge in Space, Context, and Many Languages}},
  booktitle = {Proceedings of the 20th International Conference Companion on World Wide Web, WWW 2011, Hyderabad, India},
  year = {2011},
  pages = {229--232},
  publisher = {ACM}
  }

• 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},
  title = {{AIDA: An Online Tool for Accurate Disambiguation of Named Entities in Text and Tables}},
  booktitle = {Proceedings of the 37th International Conference on Very Large Databases, VLDB 2011, Seattle, WA, USA},
  year = {2011},
  pages = {1450--1453}
  }

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

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

• 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},
  title = {{Discovering Links Using Semantic Relatedness}},
  booktitle = {INEX 2009 Workshop Preproceedings, 2009, Brisbane, Australia},
  year = {2009},
  pages = {314--325}
  }

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