“Time, Truth, Actuality, and Causation," International Conference on “God and the Future," Theology Faculty of Humboldt University, Berlin, Germany, September, 2009.

 “The Probability that God Exists," TheoLogica Conference on “Formal Methods in the Epistemology of Religion," Leuven, Belgium, June, 2009.
 
“In Defense of Perdurantism," Colorado Summer Seminar, July, 2009.

"Presentism and Truthmakers," American Philosophical Association, Pacific Division Meetings, April, 2009.

The John Dewey Lecture, "A Philosophical Journey," American Philosophical Association, Central Division, Chicago, February, 2009.

“How to Teach and Study the History of Philosophy," Colorado Summer Seminar, July, 2008.
 
“God and Evil," Philosophy Talk radio show, June, 2008, hosted by John Perry and Ken Taylor.

“Inductive Logic and the Probability that God Exists," 36th Annual Meeting of the Society for Exact Philosophy, University of Wyoming, May, 2008.

“The Refutation of McTaggart’s Argument,” Keynote address, University of West Virginia, Department of Philosophy Conference “Time on Trial: 100 Years of McTaggart’s Argument against the Reality of Time,” April, 2008.

"The Probability that God Exists,” American Philosophical Association Pacific Divisions Meeting, March, 2008.

“The Argument from Evil,” Keynote address, Texas Tech University’s Second Annual Graduate Student Philosophy Conference, March 7-8, 2008.

“The Moral Status of Abortion:  An Overview," Abortion Conference, University of Colorado at Boulder, November, 2007.

“Metaphysics and Laws of Nature: Reductionist versus Non-Reductionist Approaches," Colorado Summer Seminar, July, 2007.
 
“The Principle of Phenomenal Conservatism," Bled Conference in Epistemology - 2007, Bled, Slovenia, May 27–June 2, 2007.

“The Mind-Body Problem,” Think! Talk, University of Colorado, April, 2007.
 
“Against Freedom of Thought and Freedom of Expression," Center for Values and Social Policy, University of Colorado at Boulder, April, 2007.

"Persistence: A Defense of Perdurantism," Philosophy Colloquium, University of Nebraska, February 24, 2006.
 
"God and the Problem of Evil," Evans Lecture, University of Nebraska, February 23, 2006.

Debate on the Existence of God, with Peter Kreeft of Boston College, at Wheaton College, Massachusetts, April, 2008, and sponsored by the Intercollegiate Studies Institute.

Debate on the Existence of God, with Peter Van Inwagen of Notre Dame University, Amherst College, March 3, 2006.