(1/06/00) "Exploring the Martian Desert": North Island Gem and Mineral Society

(1/18/00) "Basaltic Flooding of Planetary Landscapes": CSU Los Angeles, Geology Seminar

(1/18/00) "Exploring the Martian Desert": CSU Los Angeles, Geology Seminar

(1/18/00) "Basaltic Flooding of Planetary Landscapes": Sigma Xi (Orange County Chapter)

(2/14/00) "The Geological Case for Life on Mars": SDSU, Biology Lecture Series

(2/16/00) "The Geological Case for Life on Mars": USD, Science Lecture Series

(2/23/00) "The Geological Case for Life on Mars": CSU Fullerton, Biology Seminar Series

(3/17/00) "Collisions of Comets and Planets": Ventura County Astronomical Society

(3/26/00) "The Geology of Meteorites": Natural History Museum of Los Angeles County

(3/30/00) "The Geological Case for Life on Mars": CSU Long Beach, Seminar in Biology

(4/07/00) "Exploring the Martian Desert": South Bay Astronomical Society

(4/14/00) "Exploring the Martian Desert": San Diego Mineral and Gem Society

(4/27/00) "The Geological Case for Life on Mars": CSU San Marcos, Biology/Chemistry Seminar Series

(5/19/00) "Collisions of Comets and Planets": San Diego Astronomy Association

(5/27/00) "Exploring the Martian Desert": San Diego Mensa Regional Gathering

(6/05/00) "Collisions of Comets and Planets": China Lake Astronomical Society

(6/17/20) "Basaltic Flooding of Planetary Landscapes": San Jose Astronomical Association

(7/07/00) "Collisions of Comets and Planets": Tucson Amateur Astronomy Association

(7/14/00) "Exploring the Martian Desert": El Cajon Valley Gem and Mineral Society

(7/20/00) "Doomsday Asteroids and Comets": USD University of the Third Age Program

(9/08/00)  "Exploring the Martian Desert": Mineralogical Society of Southern California

(9/15/00)  "The Geological Case for Life on Mars": CSU Northridge, Biology Colloquium

(9/22/00)  "Loss of Volatile Constituents from the Terrestrial Planets": SDSU Astronomy Colloquium

(10/12/00) "Loss of Volatile Constituents from the Terrestrial Planets": CPSU San Luis Obispo, Physics Colloquium

(10/16/00) "Loss of Volatile Constituents from the Terrestrial Planets": SJSU, Geology Club Lecture

(10/17/00) "The Geological Case for Life on Mars": SJSU, Biology / Sigma Xi Lecture

(10/21/00) "Planetary Geology: The Sulfurous Deposits of Io": Riverside Astronomical Society

(10/25/00) "Loss of Volatile Constituents from the Terrestrial Planets": CSU Fullerton, Geology Lecture Series

(10/31/00) "Loss of Volatile Constituents from the Terrestrial Planets": UC Riverside, Hewett Club Lecture Series

(11/08/00) "The Problem With Pluto": Reuben H. Fleet Science Center

(11/10/00) "Planetary Geology: The Sulfurous Deposits of Io": Orange County Astronomers

(11/13/00) "Collisions of Comets and Planets": Los Angeles Astronomical Society

(11/15/00) "Mars: Where Did All The Water Go?": CSU San Bernardino, Geology Lecture Series

(12/08/00) "Exploring the Lunar Landscape": Astronomical Society of the Desert