• Aspects of Database Query Evaluation, Horizons in TCS: A Celebration of Mihalis Yannakakis' 60th Birthday, Princeton University, 2013.
• The Query Containment Problem: Set Semantics vs. Bag Semantics, AMW 2013, Puebla, Mexico, 2013.
• A Retrospetive on Datalog 1.0, Datalog 2.0 Workshop 2012, Vienna, Austria, 2012.
• Schema Mappings and Data Examples, LID 2011 - International Workshop on Logic in Databases, Uppsala, Sweden, 2011.
• Random Graphs and the Parity Quantifier , VIG Logic Meeting 2011, University of California, Los Angeles, 2011 and Set Theory, Model Theory, Generalized Quantifiers and Foundations of Mathematics - Meeting in Honor of Jouko Vaananen, Helsinki, Finland, 2010.
• Composing and Inverting Schema Mappings, DL 2010 - The 23rd International Workshop on Desscription Logics, Waterloo, Canada.
• Composing Schema Mappings: An Overview, INFINT 2009 - Bertinoro Workshop on Data and Service Integration, Bertinoro, Italy, 2009.
• Foundations and Applications of Schema Mappings, Departmental Seminar Talk, Oxford University Computing Laboratory, and Stanford InfoSeminar Talk, Computer Science Department, Stanford University, 2009.
• Repair Checking in Inconsistent Databases: Algorithms and Complexity, Talk at the Information Systems Seminar, Oxford University Computing Laboratory, 2009.
• Answering Aggregate Queries in Data Exchange, Talk at the KRDB Research Center for Knowledge and Data, Free University of Bozen-Bolzano, 2008.
• Reflections on Finite Model Theory, Talk at the 2007 IEEE Symposium on Logic in Computer Science (LICS 2007).
• Inductive Definability & Finite Variable Logics: From Logic to Computer Science, Talk at the 2005 Panhellenic Logic Symposium, dedicated to Yiannis N. Moschovakis.
• Schema Mappings, Data Exchange, and Metadata Management, Talk at the 2005 ACM Symposium on Principles of Database Systems (PODS 2005).

Invited Tutorials & Short Courses

• Schema Mappings and Data Examples, 2013 EDBT Tutorial (with Balder ten Cate and Wang-Chiew Tan), Genoa, Italy, 2013.
• Relational Databases, Logic, and Complexity, Short Cource at the 2009 GII Doctoral School on Advances in Databases , University of Calabria, Italy, 2009.
• Foundations and Applications of Schema Mappings, Tutorial at the Workshop on Logic and Algorithms - LAA '08, Edinburgh, UK, 2008.
• Logic and Constraint Satisfaction: An Introduction, Tutorial at the AIM Workshop on Applications of Universal Algebra and Logic to the Constraint Satisfaction Problem, American Institute of Mathematics, Palo Alto, California, 2008.
• Schema Mappings and Data Exchange, Short Course at DASI '06 - Bertinoro Ph.D. School on Data and Service Integration, University Residential Center of Bertinoro, Bertinoro, Italy, 2006.
• Constraint Satisfaction and Logic, Tutorial at the International Workshop on Mathematics of Constraint Satisfaction: Algebra, Logic, and Graph Theory, University of Oxford, 2006.

• What is PODS from the Scientific Perspective?, Panel on "Reflections on PODS" 2013 ACM SIGMOD/PODS Conference, New York, 2013.
• Computer Science Workshops: Blurring the distinction between conferences and workshops, and duplicate-submission policies, Panel on Paper and Proposal Reviews: Is the Process Flawed?, 2008 CRA Snowbird Conference.
• How can academia and industry work together to address educational issues , Panel Presentation at the 2007 Google Education Summit.