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((short description|Artificial Intelligence researcher))
((copyedit|date=November 2023))
((Infobox scientist
| name              = Jens Lehmann
| image             = File:Jens Lehmann (Computer Scientist).jpg
| birth_date        = ((birth date and age|1982|03|29|df=yes))
| birth_place       = [[Meissen]], [[Saxony]], [[West Germany]]
| nationality       = German
| work_institution  = [[University of Bonn]], [[University of Leipzig]], [[University of Oxford]], [[Fraunhofer Society|Fraunhofer IAIS]], Institute for Applied Informatics (InfAI)
| website           = http://jens-lehmann.org
| field             = Knowledge Graphs, Conversational AI, Large-scale Data Analytics (Big Data), Relational Learning
| thesis_url        = http://jens-lehmann.org/files/2010/phd_thesis.pdf
))
'''Jens Lehmann''' is a [[computer scientist]], who works with [[Knowledge graph|knowledge graphs]] and [[artificial intelligence]]. He is a principal scientist at [[Amazon (company)|Amazon]], an honorary professor at [[TU Dresden]]<ref>((cite web|title=TU Dresden: The Faculty Of Computer Science Welcomes Honorary Professor Jens Lehmann|url=https://tu-dresden.de/ing/informatik/die-fakultaet/news/die-fakultaet-informatik-begruesst-honorarprofessor-jens-lehmann|website=TU Dresden|accessdate=7 November 2022|date=21 November 2022))</ref> and a fellow of [[European Laboratory for Learning and Intelligent Systems]].<ref>((cite web |last1=ELLIS |title=European Laboratory for Learning and Intelligent Systems |url=https://ellis.eu/fellows |website=European Laboratory for Learning and Intelligent Systems |accessdate=19 December 2020))</ref> Formerly, he was a full professor at the [[University of Bonn]], Germany and lead scientist for Conversational AI and Knowledge Graphs at [[Fraunhofer Society|Fraunhofer IAIS]]. 

==Research==
In 2007, Lehmann co-founded the [[DBpedia]] knowledge graph project.<ref name='second'>DBpedia: A nucleus for a web of open data, S. Auer, C. Bizer, G. Kobilarov, J. Lehmann, R. Cyganiak, Z. Ives, International Semantic Web Conference 2008, 722-735, the ISWC 10 Year Best Paper Award</ref><ref name='four'>DBpedia – A crystallization point for the web of data, J. Lehmann et al. (shared first author), Journal of Web Semantics, 7(3):154–165, 2009, Journal of Web Semantics 2006–2010 Award.</ref><ref name='six'>DBpedia SPARQL benchmark – performance assessment with real queries on real data, M. Morsey, J. Lehmann, S. Auer, and A. Ngonga Ngomo, International Semantic Web Conference 2011, ISWC Best Paper Award.</ref>

Lehmann also works on Symbolic Artificial Intelligence, in particular for learning concepts in [[Description logic|Description Logics]] (DLs)<ref name='first'>Concept learning in description logics using refinement operators, J. Lehmann and P. Hitzler, Machine Learning</ref> as well as [[Web Ontology Language]] class expressions.<ref name='five'>DL-Learner: Learning concepts in description logics, J. Lehmann, Journal of Machine Learning Research, 10:2639–2642, 2009.</ref><ref>((cite web |last1=book |title=Learning OWL class expressions |url=http://d-nb.info/gnd/141621273 |website=German National Library |accessdate=8 August 2020))</ref>

Within the field of [[Question Answering]], he developed approaches to transform natural language questions into queries against a knowledge graph.<ref name="three">Template-based question answering over RDF data, C. Unger, L. Buhmann, J. Lehmann, A. Ngonga-Ngomo, D. Gerber, P. Cimiano, World Wide Web Conference 2012, 639-648.</ref> He investigates representation learning approaches for knowledge graphs and their application in downstream machine learning tasks.<ref name="kgebenchmarking">Bringing Light Into the Dark: A Large-scale Evaluation of Knowledge Graph Embedding Models Under a Unified Framework, Ali, M., Berrendorf, M., Hoyt, C. T., Vermue, L., Galkin, M., Sharifzadeh, S., Fischer, A., Tresp, V. and Lehmann, J., arXiv preprint arXiv:2006.13365 (2020).</ref><ref name="pykeen">PyKEEN 1.0: A Python Library for Training and Evaluating Knowledge Graph Embeddings, Ali, M., Berrendorf, M., Hoyt, C. T., Vermue, L., Sharifzadeh, S., Tresp, V. and Lehmann, J., arXiv preprint arXiv:2007.14175 (2020).</ref>

Within the scope of the Center for Explainable and Efficient AI Technologies CEE AI,<ref>((cite web|title=Fraunhofer und TU Dresden: Neues Zentrum für Kognitive Produktionssysteme und KI-Zentrum|url=https://www.silicon-saxony.de/news/news-detail/archive/2019/february/article/fraunhofer-und-tu-dresden-neues-zentrum-fuer-kognitive-produktionssysteme-und-ki-zentrum/11/|website=Silicon Saxony|accessdate=15 October 2020|date=11 February 2019))</ref><ref>((cite web|title=Dieses Forschungszentrum wird Dresden verändern|last1=Schön|first1=Stephan|url=https://www.wirtschaft-in-sachsen.de/news/dieses-forschungszentrum-wird-dresden-veraendern-gid-3234?_region=dresden|website=Wirtschaft in Sachsen|date=12 February 2019|accessdate=15 October 2020|archive-date=26 May 2021|archive-url=https://web.archive.org/web/20210526163246/https://www.wirtschaft-in-sachsen.de/news/dieses-forschungszentrum-wird-dresden-veraendern-gid-3234?_region=dresden|url-status=dead))</ref> a collaboration between the [[Fraunhofer Society]] and [[Technische Universität Dresden]], Jens Lehmann was coordinating the Fraunhofer IAIS Dresden lab with a main focus on Conversational Artificial Intelligence.<ref>((cite web |last1=Stelzer |first1=Gerhard |title=Wie intelligent ist KI?: Kommunikation mit Missverständnissen |url=https://www.elektroniknet.de/halbleiter/prozessoren/wie-intelligent-ist-ki.171999.html|website=Elektronik.de|language=de|date=6 December 2019|accessdate=7 August 2020))</ref>

Recent projects include a demonstrator presented at [[Hannover Messe|Hannover fair]] 2019<ref>((cite web |last1=Lauer |first1=Bernhard |title=Smarter Sprachassistent mit Domänenwissen |url=https://www.dotnetpro.de/diverses/smarter-sprachassistent-domaenenwissen-1685029.html |website=dotnetpro |date=4 March 2019|accessdate=7 August 2020))</ref> in a collaboration between the Fraunhofer Cluster of Excellence Cognitive Internet Technologies, [[Volkswagen]] and the Fraunhofer Institute for Integrated Circuits IIS,<ref>((cite web |last1=Interview |first1=phys |title=Smart voice assistant answers your questions |url=https://phys.org/news/2019-03-smart-voice.html |website=phys |date=1 March 2019|accessdate=19 August 2020))</ref> and the SPEAKER project towards an AI platform for [[business-to-business]] speech assistants.<ref>((cite web|title=Projekt Speaker startet Aufbau einer KI-Plattform für B2B Sprachassistenten|url=https://www.elektro-automatisierung-digital.de/branchennews/projekt-speaker-startet-aufbau-einer-ki-plattform-fuer-b2b-sprachassistenten|website=EAD-portal|date=15 April 2020|accessdate=15 October 2020))</ref>

== Education and career ==
Lehmann graduated with a master's degree in [[Computer Science]] from the [[Technical University of Dresden]] and the [[University of Bristol]] in 2006. He then obtained a doctoral degree (Dr. rer. nat) with grade summa cum laude at the [[Leipzig University]] in 2010<ref>((cite book |last1=Lehmann |first1=Jens |title=Learning OWL Class Expressions |date=2010-01-05 |publisher=Dissertation Universität Leipzig |location=Leipzig |pages=223 |url=http://jens-lehmann.org/files/2010/phd_thesis.pdf |accessdate=7 August 2020))</ref> and was a research visitor at the [[University of Oxford]]. In 2013, he became a leader of the ''Agile Knowledge Engineering and Semantic Web'' research group (AKSW) at the [[Leipzig University]]. Subsequently, he was appointed as professor at [[University of Bonn]] and Fraunhofer IAIS in 2015. Since 2016, he is leading the Smart Data Analytics Research Group involving researchers from the University of Bonn, Fraunhofer IAIS, the Institute of Applied Informatics co-affiliation with the University of Leipzig and TU Dresden. In 2019, he started the Fraunhofer IAIS Dresden lab.

In 2022, he moved to Amazon as principal scientist and was awarded honorary professor at [[TU Dresden]]. 

== Awards ==
The impact of his research has been awarded in different ways by the community. He received the 10 Year SWSA Award<ref>((cite web |last1=Horrocks |first1=Ian |title=SWSA 10-year award 2017 |url=http://swsa.semanticweb.org/content/swsa-10-year-award-2017 |website=Semantic Web Science Association |accessdate=7 August 2020))</ref> for his work on DBpedia together with other co-founders that was published at the [[International Semantic Web Conference]], the [[Semantic Web (journal)|Semantic Web Journal]] outstanding paper Award,<ref>((cite web |last1=Hitzler |first1=Pascal |title=Semantic Web journal Awards 2014 |url=http://www.semantic-web-journal.net/blog/semantic-web-journal-awards-2014 |website=Semantic Web – Interoperability, Usability, Applicability an IOS Press Journal |accessdate=7 August 2020))</ref> ESWC 7-Year Most Influential Paper Award, Outstanding Paper Award Winner at the Literati Network Awards for Excellence 2013, the ISWC 2011 Best Research Paper Award, and the [[Journal of Web Semantics]] Most Cited Paper Award 2006–2010. He also received a 10-year award <ref>((cite web |last1=ILP |title= Semantic Web Journal |url=https://www.amazon.science/latest-news/jens-lehmann-receives-semantic-web-journal-10-year-award-for-influential-paper |website=SWJ |date= 4 November 2022 |accessdate=21 November 2022))</ref> for his work on LinkedGeoData.

For his early work on learning concepts in description logics, he received the Best Student Paper Award <ref>((cite web |last1=ILP |title=Best Student Paper Award |url=https://jens-lehmann.org/wp-content/uploads/2007/02/ilp2007-best-student-paper-award-scaled.jpeg |website=IIP |accessdate=21 November 2022))</ref> at the International Conference on Inductive Logic Programming (ILP) 2007.

== References ==
<references />

== External links ==
* [https://sda.tech/ Smart Data Analytics research group]
* [https://www.heise.de/newsticker/meldung/Dresden-wird-zum-Zentrum-fuer-Kuenstliche-Intelligenz-4305590.html CEE.AI]
* [https://www.iais.fraunhofer.de/de/presse/presseinformationen/presseinformationen-2019/presseinformation-190918.html Speaker Project]
* ((google scholar id|sEaQ5rgAAAAJ))
((authority control))
((DEFAULTSORT:Lehmann, Jens))
[[Category:Academic staff of the University of Bonn]]
[[Category:1982 births]]
[[Category:Living people]]
[[Category:German computer scientists]]
[[Category:Semantic Web people]]
[[Category:Artificial intelligence researchers]]
[[Category:Machine learning researchers]]

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