Proterozoic Geology of the Wet Mountains: New Mexico Institute of Mining and Technology (1987); Waseda University, Tokyo (1990); Colorado State University (1989); Colorado College (1988); Carleton College (1994)
Modern Volcanology: Colorado College (1987)
The Gaia Hypothesis & Humanizing the Sciences: ACM Conference on Science and the Liberal Arts (1989); Temple University at Tokyo (1990); Kansai Gaidai (1990); Thursdays-at-Eleven: Colorado College (1991)
Aikido Workshop and Demonstration: Colorado College Symposium on Nonviolence (1992)
Petrology of the Anorogenic Pikes Peak Batholith, Waseda University (2000, 2002); Colorado College Natural Science Division (2003)
The American Southwest-Building a Continent; Damming the Colorado River- to Waseda University Geology class in Arizona (2001, 2002, 2003); in Japan (2002)