(9/09/81) "Indications of Salt Weathering on the Martian Landscape": SDSU, Geology Lecture Series

(9/23/81) "Indications of Salt Weathering on Earth and Mars": CSU Fullerton, Geology Club Lecture Series

(1/27/82) "Indications of Salt Weathering on Earth and Mars": UC Riverside, Hewett Club Lecture Series

(10/?/88) "Comparative Planetology: A New Way to View the Earth": SDSU, Graduate Seminar in Geology

(10/?/89) "Comparative Planetology: A New Way to View the Earth": SDSU, Graduate Seminar in Geology

(10/?/91) "Indications of Salt Weathering on the Martian Landscape": UCSD, SIO Marine Geology Seminars

(9/27/94) "Volcanic and Impact Structures on the Terrestrial Planets": SDSU, Graduate Seminar in Geology

(2/08/95) "Volcanic and Impact Structures on the Terrestrial Planets": SDSU, Geology Lecture Series

(9/26/95) "Basaltic Flooding of Planetary Landscapes": SDSU, Graduate Seminar in Geology

(10/25/95) "Evolution of the Galilean Satellites of Jupiter": SDSU, Geology Lecture Series

(1/26/96) "Planetary Geology: The Sulfurous Deposits of Io": Loma Linda University, Natural Science Seminar

(2/21/96) "Planetary Geology: The Sulfurous Deposits of Io": CSU Fullerton, Geology Club Lecture Series

(3/21/96) "A Field Trip Through the Solar System": SDSU, Geology Annual Alumni Banquet Speaker

(4/16/96) "Near-Earth Asteroids": SDSU, Educational Growth Opportunities Program

(6/25/96) "Near-Earth Asteroids": SDSU, Continuing Education Center @Rancho Bernardo

(12/3/96) "Venus, Earth and Mars: Solar System Neighbors": SDSU, Educucational Growth Opportunities Program

(1/21/97) "A Tour of the Solar System": San Diego Mensa Monthly Gathering

(1/23/97) "Venus, Earth and Mars: Solar System Neighbors": SDSU, Continuing Education Center @ Rancho Bernardo

(2/03/97) "A Field Trip Through the Solar System": San Diego Association of Geologists / South Coast Geological Society

(3/05/97) "The Igneous Rocks of Venus: Intrusions, Extrusions and Impactites": SDSU, Geology Lecture Series

(7/12/97) "Rocks and Minerals of the Space Age": El Cajon Valley Gem and Mineral Society