Building A Formal Arabic Ontology (Invited Talk). The Experts Meeting On Arabic Ontologies And Semantic Networks. Alecso, Arab League. Tunis, July 26-28, 2011.
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The Palestinian Government Ontology (Invited Talk). The Experts Meeting On Arabic Ontologies And Semantic Networks. Alecso, Arab League. Tunis, July 26-28, 2011.
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Ontology-based Data Governance. eGovernance Workshop, at the Ministry of Telecommunication and Information Technology, Ramallah, Palestine, 28/6/2011.
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Ontology-Based Data And Process Governance Framework -The Case Of E-Government Interoperability In Palestine (Research Article). the IFIP International Symposium on Data-Driven Process Discovery and Analysis (SIMPDA’11). Campione, Italy. June 30, 2011.
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Arabic Ontology Engineering –Research Challenges and Opportunities (Keynote Speech). The International Conference on Intelligent Semantic Web - Services and Applications (ISWSA 2011). Amman, Jordan. 18/4/2011.

eGovernment Interoperability Framework in Palestine (Invited Lecture), at the Service Oriented Architecture Course, Masters on eGovernment. University of Trento, Italy Dec 2010.

Building an Arabic Ontology, for Information Search and Integration (Invited Talk). ExpoTech III, Birzeit University, Palestine. 16/4/2010.

Web 3.0, The third generation of the Web (Invited Talk). ExpoTech III, Birzeit University, Palestine. 16/4/2010.

Mechanisms of Connecting IT Colleges in the Fields of Research and Teaching (Invited Speaker) , Workshop on Evaluation of IT curriculum in Palestinian universities. Arab American University, Palestine. 28/3/2010.

Legal Ontology Engineering (30-hours Tutorial). Institute of Law, Birzeit University, Palestine. 2009.

Ontology-Based e-Governance (Invited Lecture). E-government Course. Birzeit University, Palestine. 17/12/2009.

A Data Mashup Language for the Data Web (Invited Speaker). IFIP 2.6 Research Workshop. Nicosia, Cyprus. 24/4/2009.

A Data Mashup Language for the Data Web (Research Article). LDOW'09 –WWW Conference. Madrid, Spain. 20/4/2009.

MashQL: A Query Formulation and Mashup Language (SEARCHiN Meeting). University of Cyprus, Nicosia. 25/2/2009.

Towards Data Mashups and Pipes . ONISW’08 –CiKM Conference. Napa Valley, California, USA. 30/10/2008.

MashQL: Towards Data Mashups and Pipes (Invited Talk). University of Athens, Greece. 21/10/2008.

Web 3.0 Information Systems (Invited Lecture). The “Research and Technology” Course (CS671). University of Cyprus, Nicosia. 19/2/2008.

Information Search (SEARCHiN Kick-off Meeting). University of Cyprus, Nicosia. 10/12/2007.

Semantic Pipes -Towards Effective Information Search (SEARCHiN Kick-off Meeting). University of Cyprus, Nicosia. 10/12/2007.

Web 2.0, Social Programming, and Mashups (What is in it for me!). University of Cyprus. 6/12/2007.

Formalizing ORM using the DLR and the SHOIN/OWL description logics. The International Workshop on Object-Role Modeling (ORM’05). Algarve, Portugal. 28/11/2007.

Reasoning on ORM Schemes -Formalizing ORM using DLR and SHOIN/OWL. The International Conference on Conceptual Modeling ER’07. Auckland, New Zealand. 8/11/2007.

Ontology Engineering –Challenges and Opportunities (Invited Lecture). University of Cyprus. 13/9/2007.

ORM and Description Logic (Invited Lecture). “Web Information Systems” Course. University of Hasselt, Belgium. 19/4/2007.

Reasoning on ORM Schemes . The Dutch-Belgian Database Day. Brussels. 15/11/2006.

Towards the adoption of linguistic resources in formal ontology engineering . IFIP 2.12/12.4 Research Meeting. Montpellier, France. 2/11/2006.

The Ontology Outreach Advisory . The OOA Kick-off workshop on Semantic challenges and opportunities in the Human Resources Domain - As part of the ePortfolio Conference. Oxford, England. 11/10/2006.

Towards the notion of gloss, and the adoption of linguistic resources in formal ontology engineering . The WWW Conference, Semantic Web Track. Edinburgh, UK. 26/5/2006.

Unsatisfiability Reasoning Patterns in ORM Conceptual Schemes . The International Conference on Semantics in Networked Word (ICSNW’06), Munich, Germany. 29/3/2006.

Modularization and Auto-Composition of ORM Schemes . The International Workshop on Object-Role Modeling (ORM’05). Larnaca, Cyprus. 3/11/2005.

The Double Articulation principle for Ontology Engineering . University of Trento, Italy. 31/8/2005.

Towards Methodological Principles for Ontology Engineering . PhD Public Defense. Vrije Universiteit Brussel, Belgium. 26/5/2005.

Ontology Modularization and Composition . Workshop on Ontology Modularization and Context. Vrije Universiteit Brussel, Belgium. 14/10/2004.

The Dogma methodology for Ontology Engineering (Invited Talk). IFIP 2.6 Research Workshop. Catania, Sicily, Italy. 7/11/2003.

Ontology-based Customer Complaint Management . Workshop on Regulatory Ontologies and the modeling of complaint regulations (WORM’03) Catania, Sicily, Italy. 4/11/2003.

Formal Ontology Engineering -The DOGMA Approach . The International Conference on Ontologies, Databases and Applications of Semantics, ODBase’02. Irvine California. 31/10/2002.

A Conceptual Markup Language that Supports Interoperability between Business Rule Modeling Systems . The 10th International Conference on Cooperative Information Systems (CoopIS 02). Irvine California. 31/10/2002.

A Markup Language for ORM Business Rules . The International Workshop on Rule Markup Languages for Business Rules on the Semantic Web, (RuleML 2002). Sardinia, Italy. 14/6/2002.

Decomposing Ontology into an Ontology Base and its Interpretation Layer . Dagstuhl Seminar Nº 02061: Rule Markup Techniques for the Semantic Web. Dagstuhl, Germany 3/2-8/2/2002.