Press Release on Mars Surface Water Features. 

North American Carbon Program (NACP) Principal Investigator.

Second International Meeting on Mechanisms of Organic Matter Stabilization in Soils, Oct 9-12. 2005. Monterey, California. Chair of Local Organizing Committee:

National Soil Carbon Network Co-Investigator and Participating Scientist

Frontiers in Global Soil Change – American Geophysical Union – Session Co-Chair 2009,2010

NASA Biodiversity and Ecological Forecasting Team Team Member