October 10, 2012: From Ontologies to Web Ontologies: Lessons learned from Conceptual Modeling for the WWW
Keynote talk at EKAW 2012, Galway, Ireland. Video recording of the talk at vimeo.com.

June 26, 2012: The Future of Marketing on the Web
Keynote talk at the MakoLab Semantic Day 2012, Bibliothèque Polonaise De Paris, Paris, France.

May 24, 2012: RDFa & GoodRelations: Marketing with Structured Data - From Semantic SEO to Linked Open Commerce
Keynote talk at the Oxid Commons 2012, Messe Freiburg, Freiburg, Germany. Video recording of the talk at vimeo.com.

October 28, 2010: The Semantic Web and its Impact on International Websites
Invited talk at the International Search Summit 2010, The British Library, London, UK.

October 15, 2010: Ontology Engineering for Linked Data: What Makes For A Good Ontology?
Keynote at the 1st Workshop on Knowledge Injection into and Extraction from Linked Data (KIELD2010), Lisbon, Portugal.

September 18, 2010: The GoodRelations Ontology for E-Commerce
Invited talk at the 3rd KRDB school on Trends in the Web of Data (KRDBs-2010), Brixen-Bressanone, Italy.

September 14, 2010: Linked Data in E-Commerce – The GoodRelations Ontology,
Keynote at the ISKO UK Conference on Linked Data, September, London, UK.
Video recording on vimeo.com (49:37)

November 19, 2009: Real Business Impact for the Semantic Web: GoodRelations & RDFa for Deep Comparison Shopping on a Web Scale
Invited talk at the Semantic Web Meetup Zurich, Switzerland.

November 18, 2009: Using GoodRelations
Jon Udell interviews Martin Hepp for his "Interviews with Innovators" podcast on the IT Conversations network, the longest-running podcast on the planet.

October 1, 2009: Web 3.0. für Spezialversender: Weniger Preiswettbewerb durch maschinengeeignete Produktbeschreibungen im WWW
Deutscher Versandhandels-Kongress, Wiesbaden, Germany.

September 2, 2009: Product Variety, Consumer Preferences, and Web Technology: Can the Web of Data Reduce Price Competition and Increase Customer Satisfaction?
10th International Conference on Electronic Commerce and Web Technologies (EC-Web 09), Johannes Kepler University of Linz , Linz, Austria.

April 2, 2009: Semantic Web-based E-Procurement
Industry Workshop "Produktivität im Vertriebsprozess durch Interoperabilität", organized by the Deutsches Forum für Interoperabilität e.V., Konstanz, Germany

October 16, 2008: The GoodRelations Ontology: Making Semantic Web-based E-Commerce a Reality
Invited talk in the Ontolog Emerging Ontology Showcase series (on-line), session 2.
Click here for the slides and here for a podcast / MP3 recording. (Hint: When listening to the recorded session, it is recommended that you have the slide set opened. Slide numbers will be announced so that you can sync what you see with the recorded talk.)
Click here for a slidecast (slides and audio track) at slideshare.net.

September 17, 2008: Ontology Economics
Invited talk at the International Workshop on Web Information systems 2.0: Social, Economical, and Technological Challenges, VUB - STAR Lab, Brussels, Belgium

September 25, 2007: Semantic Business Process Management in ERP-centric Environments
Invited talk at SABRE 2007 Conference - Software, Agents, and Services for Business, Research, and E-Sciences, Leipzig, Germany

June 30, 2006: Digital Enterprise Research: Semantics in Business Information Systems
Invited Talk at the Symposium "180 Days of DERI Innsbruck", Innsbruck, Austria

June 11, 2006: Semantics in Business Process Management: The Grand Vision and the Low Hanging Fruits
Keynote at the ESWC 2006 Workshop "Semantics for Business Process Management 2006" (SBPM 2006), Budva, Montenegro

May 31, 2006: Digital Enterprise Research: Semantics in Business Information Systems
Opening Keynote at the 9th International Conference on Business Information Systems (BIS 2006) in cooperation with ACM SIGMIS, Klagenfurt, Austria
Click here for the slides.

February 8, 2006: Semantics, Web, and Services
Keynote at the MODINIS Workshop "Good Practice on Interoperability at Local and Regional Level - Examples of Semantic Interoperability in Austria and the United Kingdom?", Vienna, Austria

November 24, 2005: Semantic Web and Semantic Web services: Father and Son or Indivisible Twins?
Invited Talk at Semantics 2005, Vienna, Austria

June 2, 2005: Semantic Web and Ontologies: New Horizons for Automated Information Processing
(jointly with Chris Bussler; in German)
Dinner Speech at the Value Chain Forum 2005, Kartause Ittingen (near St. Gallen), Switzerland

October 25, 2009: ISWC 2009 Tutorial: The Web of Data for E-Commerce in Brief. A Hands-on Introduction to the GoodRelations Ontology, RDFa, and Yahoo! SearchMonkey (jointly with Richard Cyganiak),
Westfields Conference Center near Washington, DC, USA.

September 15, 2009: IEEE / WIC / ACM WI/IAT 2009 Tutorial: The Web of Data for E-Commerce in Brief. A Hands-on Introduction to the GoodRelations Ontology, RDFa, and Yahoo! SearchMonkey (jointly with Michael Hausenblas),
Università degli Studi di Milano Bicocca, Milano, Italy.

July 20, 2009: IEEE CEC'09 Tutorial: The Web of Data for E-Commerce. A Hands-on Introduction to the GoodRelations Ontology, RDFa, and Yahoo! SearchMonkey (jointly with Michael Hausenblas),
Vienna, Austria.

May 31, 2009: ESWC 2009 Tutorial: The Web of Data for E-Commerce in One Day. A Hands-on Introduction to the GoodRelations Ontology, RDFa, and Yahoo! SearchMonkey (jointly with Michael Hausenblas),
Heraklion, Crete, Greece.

June 3, 2009: Lightning Talks at the 6th Annual European Semantic Web Conference (ESWC2009), Heraklion, Crete, Greece:
Title: What Makes for A Good Ontology?
Description: In this Lightning Talk, I argue that the most important characteristic of a good ontology is the quality of the categories defined, i.e. to which degree the ontology provides categories that are valid (1) over time, (2) across individuals, and (3) across contexts.
Slide as PDF

October 30, 2008: Lightning Talks at the 7th International Semantic Web Conference (ISWC 2008), Karlsruhe, Germany:
Talk 1: Building Vocabularies: Which Terms Are Most Valuable - The Most Popular, the Frequent, or the Rare?
Description: When we design ontologies for the Semantic Web, we can mostly not include all potential conceptual elements due to time and resource constraints. But which ones should we include: The frequent ones or those on the long tail?
Slide: talk1 (PNG)

Talk 2: We must find an efficient notion of identity
Description: The current Web and Semantic Web stack requires that conceptual elements defined by a URI represent a clearly defined set of objects. In this talk, I argue that the choice of the notion of sameness must not be done arbitrarily but such that the reuseability of data in new contexts is maximed; and that this is an important and difficult design decision.
Slide: talk2 (PNG)

Talk 3: In and Out of Popular Structures: A Hidden Bottleneck for Ontology Adoption
Description: In order to be adopted by broad audiences, Web ontologies must not make more subtle conceptual distinctions than popular database schemes support; otherwise, populating the knowledge base is unfeasible for potential publishers of data. On the other hand, our structures must be subtle enough to allow rule-based import of Web data into common target structure.
Slide: talk3 (PNG)

October 28, 2008: OntoNaviERP: Ontology-supported Navigation in ERP Software Documentation
7th International Semantic Web Conference (ISWC 2008), Karlsruhe, Germany
See here for a PDF version of the slides and here for a Web version of the slides (HTML/PNG).

October 3, 2008: E-Business Vocabularies as a Moving Target: Quantifying the Conceptual Dynamics in Domains
16th International Conference on Knowledge Engineering and Knowledge Management (EKAW2008), Acitrezza, Italy

October 3, 2008: GoodRelations: An Ontology for Describing Products and Services Offers on the Web
16th International Conference on Knowledge Engineering and Knowledge Management (EKAW2008), Acitrezza, Italy

June 4, 2007: GenTax: A Generic Methodology for Deriving OWL and RDF-S Ontologies from Hierarchical Classifications, Thesauri, and Inconsistent Taxonomies
4th European Semantic Web Conference (ESWC 2007), June 3-7, Innsbruck, Austria

April 25, 2007: ProdLight: A Lightweight Ontology for Product Description Based on Datatype Properties
10th International Conference on Business Information Systems (BIS 2007), April 25-27, Poznan, Poland

March 1, 2007: An Ontology Framework for Semantic Business Process Management
8th international conference Wirtschaftsinformatik 2007, February 28 - March 2, 2007, Karlsruhe, Germany

June 14, 2006: The True Complexity of Product Representation in the Semantic Web
14th European Conference on Information System (ECIS 2006), June 12-14, 2006, Gothenburg, Sweden

June 14, 2006: Towards the Semantic Web in E-Tourism: Can Annotation Do the Trick?
14th European Conference on Information System (ECIS 2006), June 12-14, 2006, Gothenburg, Sweden

November 7, 2005: Representing the Hierarchy of Industrial Taxonomies in OWL: The gen/tax Approach
ISWC Workshop on Semantic Web Case Studies and Best Practices for eBusiness (SWCASE'05), Galway, Irland

October 19, 2005: A Quantitative Analysis of eCl@ss, UNSPSC, eOTD, and RNTD: Content, Coverage, and Maintenance
IEEE International Conference on e-Business Engineering (ICEBE 2005), Tsinghua University, Beijing, China

October 19, 2005: Semantic Business Process Management: A Vision Towards Using Semantic Web Services for Business Process Management
IEEE International Conference on e-Business Engineering (ICEBE 2005), Tsinghua University, Beijing, China

May 27, 2005: A Methodology for Deriving OWL Ontologies from Products and Services Categorization Standards
13th European Conference on Information Systems (ECIS 2005), Regensburg, Germany

April 1, 2005: Content Metrics for Products and Services Categorization Standards
2005 IEEE International Conference on e-Technology,e-Commerce and e-Service (EEE'05), Hong Kong

May 12, 2004: OntoMeter: Metrics for Ontologies,
Poster Presentation at the European Semantic Web Symposium (ESWS 2004), Heraklion, Crete, Greece

March 11, 2004: Measuring the Quality of Descriptive Languages for Products and Services
Multi-Konferenz Wirtschaftsinformatik 2004 (MKWI 2004), Essen, Germany

April 10, 2003: Product Reasoning Services: Economic Relevance and Architectural Approaches
5th Paderborner Frühjahrstagung "Innovationen im E-Business", Paderborn, Germany

April 11, 2002: Marketplace Interoperability, Meta-Marketplaces, and Agent-based Arbitrators (in German)
4th Paderborner Frühjahrstagung "Modelle im E-Business", Paderborn, Germany

November 19, 2009: The GoodRelations Ontology: Upcoming Research Challenges for the Semantic Web Community,
Dynamic and Distributed Information Systems Group (Prof. Abraham Bernstein), Department of Informatics, University of Zurich.

March 18, 2009: "The World Wide Web and the Wealth of Nations: Does IT Matter?"
Inaugural Lecture, Universität der Bundeswehr München, Neubiberg, Germany

November 23, 2006: Possible Ontologies: How Reality Constrains Building Relevant Ontologies
Logic and Information Workshop, Schloss Münchenwiler.
Click here for the slides.

September 20, 2006: Semantik in Betrieblichen Informationssystemen (in German)
Research Seminar at the University of Wuerzburg, Wuerzburg, Germany

June 22, 2005: Product Representation in the Semantic Web
Research Seminar at the University of Trento, Trento, Italy

June 13, 2005: Semantic Web Technology and Semantic Web Services: Fundamental Layer for True eTourism
Invited Speech, partner meeting Anet - Austrian Network for e-Tourism, Salzburg Research, Salzburg, Austria

January 7, 2005: Product Representation in the Semantic Web
DERI Research Seminar, University of Innsbruck Innsbruck, Austia

March 10, 2004: Content Quality of Product Classification Systems. A Comparative Analysis and its Implications
Institut der Deutschen Wirtschaft, Cologne, Germany

February 21, 2004: Descriptive Languages for Products and Services
University of Innsbruck, Department of Computer Science, Innsbruck, Austria

March 3, 2003: Product Categorisation as a Semantic Standardization Problem
Department of Computer Information Systems, Florida Gulf Coast University, Fort Myers, FL, USA

September 9, 2009: eCl@ss im Web: Mehr Kunden und bessere Stammdaten für jeden eCl@ss-Anwender
1. Würzburger eCl@ss-Tag, Würzburg, Germany.

June 23, 2009: Ihr Unternehmen im Web 3.0: Mehr Sichtbarkeit mit eCl@ss und GoodRelations
Webcast / On-line talk at eClass e.V.

June 15, 2009: Semantic Web-based E-Commerce: The GoodRelations Ontology
Semantic Technology Conference, San José, CA, USA.

April 29, 2009: Web 3.0 - The Web of Data for E-Commerce: RDF, OWL, GoodRelations, and Yahoo SearchMonkey
Online Marketing-Gipfel 2009, Wiesbaden, Germany.

April 28, 2009: E-Business on the Web of Data: The GoodRelations Vocabulary
Zweipol GmbH, Offenbach, Germany.

April 1, 2009: eCl@ss-Daten im World Wide Web: Mehr Sichtbarkeit für Ihr Unternehmen
Annual eCl@ss Member Meeting, Düsseldorf, Germany

April 16, 2008: Community-driven Ontology Construction using the myOntology Platform
eBSemantics Workshop, Vienna, Austria

June 22, 2006: eProcurement and beyond: Product Representation in the Semantic Web
Software Circle Tirol (SWCT), Innsbruck, Austria

November 4, 2005: Creating Business Ontologies: The Case of eClassOWL
Joint workshop with Arcelor S.A. on Industrial Ontologies, Innsbruck, Austria

November 4, 2005: State of the Art in Semantics in Business Information Systems
Joint workshop with Arcelor S.A. on Industrial Ontologies, Innsbruck, Austria

June 21, 2005: Research Project Semantic Television: Topic, Research Goals, Achievements
Siemens AG Austria, Vienna, Austria