"Categories and Madhyamaka"
Oxford Centre for Hindu Studies, Oxford, October 2009.
"Nagarjuna's philosophy of language as described in the Vigrahavyavartani"
Kyoto University, Kyoto, September 2009.
"A Problem for Goodmanian Constructivism"
University of East Anglia, Norwich, July 2009.
"The anti-realist's dilemma and other philosophical problems"
Columbia University, New York City, December 2008.
"Conventionally existent objects: a game-theoretic model"
Tribhuvan University, Nepal, November 2008.
"Some problems from Nagarjuna's Vigrahavyavartani"
University of Chicago, Chicago, October 2008.
"Conventional truth and the emptiness of emptiness"
Emory University, Atlanta, July 2008.
"Nagarjuna's Madhyamaka: Some philosophical problems"
Columbia University, New York City, October 2007.
"Nagarjuna's conception of svabhava"
University of Kathmandu, Nepal, July 2006.
"What do the Madhyamikas mean by 'inherent existence'?"
Oriental Institute, Oxford, May 2006.
"Two Kinds of Negation"
Westminster College, Cambridge, November 2005.
"Pictorial Implication"
20th Conference of the German Society for Philosophy (DGPhil), Berlin, September 2005.
"The Concept of Substance in Madhyamika Philosophy"
School of Oriental and African Studies, London, August 2005.
"Logical relations between pictures"
Workshop on Pictorial and Linguistic Representation, Oxford, November 2004.
"Are there innate mathematical concepts?"
Joint Session of the Mind Association and the Aristotelian Society, Canterbury, July 2004.
"Cognitive Structuralism"
Department of Pure Mathematics and Theoretical Physics, Cambridge, April 2004.
"The Knowledge of Mathematical Structures"
Faculty of Philosophy, Oxford, April 2004.
"The problematic status of ontological categories"
5th Conference of the German Society for Analytic Philosophy (GAP), Bielefeld, September 2003.
"Typings and Ontological Hierarchies"
21st World Congress of Philosophy, Istanbul, August 2003.
"Facts and their Constituents"
Joint Session of the Mind Association and the Aristotelian Society, Belfast, July 2003.
"The Problematic Status of Ontological Categories"
Moral Sciences Club, Cambridge, February 2003.
"Ramsey's Problem"
19th Conference of the German Society for Philosophy (DGPhil), Bonn, September 2002.
"The Underdetermination of Typings"
Metaphysics Graduate Conference, Leeds, August 2002.
"A Generalized Solution to Ramsey's Problem"
4th European Conference of Analytic Philosophy (ECAP), Lund, June 2002.
"Are there metamathematical arguments showing that Leibniz's characteristica universalis is an impossible project?""
8th International Leibniz Congress, Berlin, September 2001.
"A Definition of Ontological Categories in an Expansion of Belief Dynamics"
European Summer School for Symbolic Logic, Language and Information, Helsinki, August 2001.
"A Carnapian Construction of Ontological Categories"
Conference on the Vienna Circle and Logical Empiricism, Vienna, June 2001.
"Defining 'Ontological Category'"
Joint Session of the Mind Association and the Aristotelian Society, York, June 2001.
"A Definition of Ontological Categories in an Expansion of Belief Dynamics"
Logic and Logical Philosophy 3, Dresden, April 2001.
"Defining 'Ontological Category'"
Harvard/MIT Graduate Conference, Cambridge, USA, March 2001.
"The Definition of Ontological Categories"
Department of Philosophy, Cambridge, November 2000.
"Gödel, Frege and Leibniz's Dream"
History of Philosophy of Science Conference, Vienna, July 2000.
"Ontologische Notwendigkeit"
Lindenthal-Institut, Cologne, March 2000.
"Some Problems of Metaontology"
Department of Philosophy, Cambridge, November 1999.
"A Dispensable Discipline? The Progress of Science and the Place of Philosophy"
University of Fribourg, Switzerland, February 1998.