"Mars: Entscheidungsprobleme in der Weltraumforschung"
Adam-Smith Lecture, Bayreuth, December 2001.

"Plausibility Theory"
Department of Computer Science, Bonn, November 2001.

"Preference Reversals in Risk Management: Where They Occur and How to Avoid Them",
module of session on "Recent Developments in Risk and Decision Analysis at Caltech/JPL".
INFORMS, Miami Beach (Florida), November 2001.

"Inductive Inference: Philosophy Meets Artificial Intelligence" (keynote address)
International Research Center for Computer Science, Dagstuhl, July 2001.

2000

"Physical Probability"
Departments of Economics and Philosophy, Caltech, Pasadena, February 2000.

"Categorical Belief"
Decision Emergence, Zentrum für Interdisziplinäre Forschung, Bielefeld, May 2000.

1999

"As-If Economics"
Stochastic Dependence and Causality, Departments of Economics, Statistics and Philosophy, Bologna, September 1999.

"The Instability of Ex Post Aggregation"
Department of Economics, Cergy-Pontoise, June 1999.

1998

"Pareto Optimality vs. Ethical Optimality"
Department of Philosophy, Duisburg, December 1998.

"Subjectivity in Bayesian Epistemology"
King's College, London, December 1998.

"The Future of the Humanist Ideal:
  A Comparison of Educational Systems in UK, USA and FRG"
Wilhelm-von-Oranien Schule, Dillenburg, November 1998, March 1999.

"Welfare Economics"
East Anglia Triangle, Cambridge, October 1998.

"Statistical Inference Based on a Non-Probabilistic Measure of Plausibility"
Newton Institute Workshop on Bayesian Signal Processing, Cambridge, July 1998.

"Diachronic Coherence and Learning from Evidence"
Coherence and the Dynamics of Belief, Department of Philosophy, Konstanz, February 1998.

"A Very Short History of Probability and Utility"
Department of History and Philosophy of Science, Cambridge, February 1998.

1997

"Analysing Metaphysics"
Department of Philosophy, Cambridge, November 1997.

"Updating Without the Partitioning Assumption"
Department of Economics, Trento, October 1997.

"Interactive Epistemology Reconsidered"
Department of Economics, Trento, October 1997, with R.C. Jeffrey and M. Risse.

"A Representation Theorem for Iterated Contraction"
Gesellschaft für Analytische Philosophie, Munich, September 1997.
Department of Philosophy, San Diego, February 1998.

1996

"The Coherence Argument Against Conditionalization"
Department of Philosophy, Konstanz, December 1996.

"A Generalization of Aumann's Theorem"
Institute Vienna Circle, Vienna, June 1996, with R.C. Jeffrey and M. Risse.

"What it Takes to Be a Group: Pareto vs. Diversity"
Departments of Social Sciences and Economics, Caen, June 1996, with R.C. Jeffrey and M. Risse.
Department of Philosophy, Konstanz, December 1996.
London School of Economics, London, October 1997.

"Does Probability Exist?"
Departments of Philosophy, Theoretical Physics, and Economics, Trieste, May 1996, with R.C. Jeffrey and M. Risse.