• The Causality/Repair Connection in Databases: Causality-Programs. Presentation at SUM'17, Granada, Spain, Oct. 2017.
  • Some Declarative Approaches to Data Quality. Tutorial at BICOD'17. Birkbeck College, London, 2017.
  • The Ontological Multidimensional Data Model in Datalog+-. Talk at Universidad Nacional del Sur, Bahia Blanca, Argentina, June 2017.
  • Datalog+- Multidimensional Ontologies and Data Quality". Gottlob Celebration WS, Genova, Dec. 2016.
  • "Extending Weakly-Sticky Datalog+-: Query-Answering Tractability and Optimizations". Seminar "Centro de Investigacion de la Web Semantica", PUC, Chile. July 2016.
  • "ERBlox: Combining Matching Dependencies with Machine Learning for Entity Resolution". I Congreso Internacional De Ingenieria de Software y Sistemas De Informacion. Nov. 2015, Trujillo, Peru.
  • "Ontology-Based Data Access Subjects, Issues and Trends". Tutorial. XII Congreso Internacional De Ingenieria de Software y Sistemas De Informacion. Nov. 2015, Trujillo, Peru.
  • "ERBlox: Combining Matching Dependencies with Machine Learning for Entity Resolution". CLEI'15, Arequipa, Peru, Oct. 2015.
  • "Logical and Probabilistic Knowledge Representation and Reasoning". Cognitive Science Seminar. Carleton University, 2015.
  • "ERBlox: Combining Matching Dependencies with Machine Learning for Entity Resolution". Universidad del Bio-Bio, Concepcion, Chile, May 2015.
  • "Datalog Extensions as Ontology Representation Languages and their Applications". LANMR 2014, Valle de Bravo, Mexico, Nov. 2014.
  • "Ontology-Based Data Access Subjects, Issues and Trends". COMTEL, Lima, Peru, 2014.
  • "Logica y Probabilidad en Representacion de Conocimiento" (in Spanish). Jornadas Rolando Chuaqui, Santiago de Chile, 2014.
  • Datalog+-: Its Languages and Evaluation Issues. Talk at LogicBlox, Atlanta, April, 2014.
  • Contexts and Multidimensional Data Quality Assessment and Cleaning. Talk at University of Toronto, January 2014.
  • Inconsistency Handling in Databases. Short PhD course at University of Rome, La Sapienza, and University of Calabria, Arcavacata, 2013.
  • Matching Dependencies for Entity Resolution in Databases. University of Rome, La Sapienza, Sept. 2013.
  • Semantic Constraints for Data Quality Assessment and Cleaning. University of Milano, Bicocca, June 2013.
  • Entity Resolution with Matching Dependencies: Beyond Certainty". Talk at BIN AGM, Vancouver, May, 2013.
  • "Contexts for Data Quality Assessment and Cleaning". Part of plenary talk at SEBD'11, Maratea, Italy, 2011.
  • "Investigacion en Ciencia de Computacion y Manejo de Datos (vision y trayectoria personales)". Universidad de Talca, Chile, March 2013.
  • Query Rewriting in Datalog for On-The-Fly Entity Resolution. BIN AGM, Nov. 12, IBM Labs, Toronto.
  • Evolution and Change in Relational Databases An Overview of Some Issues. Talk at Dagstuhl Seminar Foundations and Challenges of Change and Evolution in Ontologies (12441), Schloss Dagstuhl, Germany, Oct. 28 - Nov. 02, 2012.
  • Business Intelligence: Recent Experiences in Canada. Talk at Universidad del Desarrollo, Santiago, Chile, August 2012.
  • Multidimensional Contexts for Data Quality Assessment. Talk at University of Chile, Santiago, Chile, August 2012.
  • Semantic Constraints for Data Quality Assessment and Cleaning. Simon Fraser University, Vancouver, Canada, July 2012.
  • Multidimensional Contexts for Data Quality Assessment. Presentation at AMW 2012 (extended) ,June 2012.
  • Contexts for Data Quality Assessment and Cleaning". BIN/IBM WS, IBM Watson Research Center, NY, February, 2012.
  • "Research in Computer Science and IT: How and Where Are We (Going)? A Chilean Perspective". Keynote presentation at Encuentros 2011, Berkeley, Nov. 2011.
  • "Semantic Constraints for Data Quality Assessment and Cleaning". Keynote Presentation at JCC'11, Curico, Chile, Nov. 2011.
  • "Semantic Constraints for Data Quality Assessment and Cleaning". Tutorial at SEBD'11, Maratea, June 2011.
  • "Contexts and Data Quality Assessment and Cleaning". Talk at BIN WS, Banff, May 2011.
  • "Inconsistency-Driven Information Sharing in Peer Data Exchange Systems". Talk at University of Washington, Seattle, April 2011. video
  • "Some Recent Fundamental Approaches to Data Quality Assessment and Cleaning". Talk at Oxford University, Computing Laboratory, and Birkbeck College, University of London. February 2011.
  • "Using Answer Set Programs to Specify Virtual Data Integration Systems: Obtaining Consistent Query Answers". Talk at LANMR09, Taxclala, Mexico, Nov. 09.
  • "From Consistent Query Answering to Query Rewriting: A Detour Around Answer Set Programs" (shorter version of talk given at LID08).
  • "Data Integration and Data Quality". Presentation at IBM CAS University Days, Toronto, 2009.
  • "Virtual Data Integration: Query Answering, Consistency and Specification". Keynote presentation at Globe 2009, Linz.
  • "Data Quality in Information Integration and Business Intelligence". Talk at the Adolfo Iba~nez University, Chile, Dec. 2008.
  • "Information Agents in a Peer Data Exchange System" (extended). Talk at University of Bio-Bio, Chile, Dec. 2008; and Univeristy of Quebec at Outaouais, Feb. 2009.
  • "From Hilbert to Turing and Beyond". Talk at University of Concepcion, Dec. 2008. extended version.
  • "Dealing with Inconsistent Data Sources: Scientific and Technical Challenges". Talk at University College Dublin, Sept. 2008.
  • "Information Agents in a Peer Data Exchange System". Talk at University of Chile and University of Rome 3, May 2008.
  • "From Consistent Query Answering to Query Rewriting: A Detour Around Answer Set Programs" (keynote presentation at LID 08), May 2008.
  • Tutorial on "Virtual Data Integration and Global Consistency" at Catholic University of Chile, Dec. 2007.
  • Tutorial on "Virtual Data Integration" at University of Concepcion, Chile, Dec. 2007.
  • Tutorial on "Virtual Data Integration" at the "Alberto Mendelzon Workshop", Punta del Este, Uruguay, Oct. 26, 2007.
  • The Semantics of Consistency and Trust in Peer Data Exchange Systems. Presentation at Universidad de la Republica, Montevideo, Uruguay, October 2007.
  • Situation Calculus Specifications of Action and Change. Presentation at Alife, Montreal, July 2007. alife.pdf
  • Presentation at University of Edimburgh, May 2007. Consistent Query Answering in Databases Under Cardinality-Based Repair Semantics.
  • Presentation at Universitat Pompeu Fabra, Barcelona, January 2007. Consistent Query Answering in Relational and XML Databases.
  • Presentation at University of Toronto, Dec. 2006. Consistent Query Answering in Databases Under Minimum Cardinality Semantics.
  • Presentation at University of Concepcion, Nov. 2006. Consistent Query Answering in Databases: Recent Developments".
  • Presentation at University of Freiburg, Germany, July 3rd, 2006. Static and Incremental Complexity of Consistent Query Answering under Attribute- and Cardinality-based Repairs.
  • Presentation at the "Workshop on Logic and Databases", Cambridge, February 2006. Cardinality-based semantics for consistent query answering: incremental and parameterized complexity.
  • Presentation at Technical University of Vienna 2005 (revised version), Complexity and Approximation of Fixing Numerical Attributes in Databases Under Integrity Constraints.
  • Course at ESSLLI 2005. slidesEsslli05.pdf. papers.
  • Presentation at Queen's University, May 18, 2005. Consistent Answers from Integrated Data Sources.
  • Presentation at University of Akureyri, April 29, 2005. Consistent Query Answering in Databases.
  • Presentation at University at Buffalo, April 14, 2005. Consistent Answers from Integrated Data Sources.
  • Presentation at Simon Fraser University, March 02, 2005. Consistent Query Answering in Databases.
  • Presentation at Simon Fraser University, March 03, 2005. Consistent Query Answering in Virtual Data Integration Systems.
  • Presentation at CanDB04, Toronto, August 2004. slides.
  • "Consistent Query Answering". Tutorial at the Italian Conference on Databases (SEBD 04). Sardinia, June 2004. slides.
  • "Query Answering in Peer-to-Peer Data Exchange Systems". Talk at the Dagstuhl Seminar on Logic Based Information Agents, April 2004. slides.
  • "Virtual Data Integration". Tutorial at International Conference of the Chilean Computer Science Society (SCCC), Chillan, Chile, November 2003. slides.
  • "Obtaining Consistent Answers from Databases". Invited talk, Universite du Quebec en Outaouais, Oct. 2003. slides.
  • "Observaciones sobre la Investigacion (en Bases de Datos)" (in Spanish). Participation in the Panel at the Chilean Workshop on Databases, Chillan, Nov. 2003. slides.