"Systemic Reflections on the De auxiliis Controversy." Czech Academy of Sciences, Prague, August 2008.

Descartes' Theory of Ideas (London: Continuum Press, 2007).

"The metaphysics of cognition in Descartes and some seventeenth-century Jesuit texts." Conference "Bohemia Jesuitica," Prague, April 2006.

"Descartes' Direct Realisms." American Philosophical Association, Pacific Division, San Francisco, April 2005.

"Much Ado About Non-Things." American Philosophical Association, Pacific Division, Pasadena, March 2004; Eighth Annual Southern California Conference of Philosophy, Riverside, October 2003.

"Material Falsity in Descartes: A Non-Issue?" American Philosophical Association, Central Division, Chicago, April 2002.

"A Paradox of Actuality." Analysis 61 (2001): 139-41. "Priest's Paradox." American Philosophical Association, Pacific Division. Albuquerque, April 2000

"Berkeley, Anselm and Semantic Paradox: A New Perspective on the Master Argument." International Berkeley Society Conference, Newport, R.I., April 21-24, 1999.

"On the Consistency of Realism." Southwest Philosophy Review 15 (1999): 55-64.