Selected Presentations

The Physics of Cosmic Airbursts, Institute for Astronomy, University of Hawaii, Sept. 28, 2022.

Tilting at Strawmen and Other Tricks of Climate Denial Enablers, Bay Area Skeptics, July 8, 2021.

Closing Arguments in the Decade-Long Clovis Comet Trial: Not Guilty! Pecos Conference of Southwestern Archaeology, Flagstaff, Arizona, Aug. 9-12, 2018.

New Risk Assessment and Early Warning of Airbursts from Small NEOs, Planetary Defense Conference 2015 Frascati, Italy, 13-17 April, 2015.

Impact did not Cause Climate Change Extinction or Clovis Termination at 12.9 ka, AGU 2011 Chapman Conference Climates, Past Landscapes, and Civilizations, Santa Fe, New Mexico, March 25, 2011

Global Warming: Inconvenient or Catastrophic? Fulbright Association forum: "Perspectives on Climate Change". Albuquerque, New Mexico, October 16, 2011.