Five Humanistic Revolutions in American Psychology," Invited address for the History Division of the American Psychological Association, 1995
"Was there a Boston "School" of Psychotherapy?" Fellows Address for the History Division of the American Psychological Association, 2000.
"Shamanism and the American Psychotherapeutic Counter Culture." Invited paper for a conference on "Shamanism, Expanded Definitions and Directions." Center for the Study of Wold Religions, Harvard University, 1999.
"A Historical Sketch of Mind/Body Medicine," Opening keynote address for Herbert Bensons’ conference on Science and Mind/Body Medicine, Harvard Medical School Dept.of Continuing Education, 2000, 2001.
"Metaphysics and Consciousness in The Varieties: Origins, meaning, and effects." Keynote lecture for the "International Interdisciplinary Centenary Conference on William James and The Varieties of Religious Experience," University of Edinburgh, Edinburgh , Scotland, July 5, 2002.
"Why Wundt's Laboratory was not Founded Until 1950: The hypothesis of the three streams." Wallace A. Russell Memorial Lecture for Division 26, History of Psychology, Annual meeting of the American Psychological Association, Toronto, Canada, Aug. 9, 2003.