Doug joined the research group in October 2008 as a postdoctoral scholar. His work has focused on analyzing the regional differences of organic composition of single and submicron particles from measurements made during the INTEX-B campaign. He also evaluated cloud condensation nuclei activity and its relation to organic composition from the same campaign. During 2009, Doug conducted field measurements of organic aerosol at the Scripps Pier using AMS and FTIR. He is participated in CalNex, a collaborative field campaign aimed at understanding the issues at the nexus of air quality and climate change problems, as part of the Russell group measurements at Bakersfield. Doug is now a Research Scientist at the University of Colorado at Boulder (CU).