Douglas S. Eisinger is the director of transportation policy and planning at Sonoma Technology, Inc. (STI). He was the mobile sources section chief for EPA Region 9 from 1991 through 1995. He has also been the program manager for the U.C. Davis-Caltrans Air Quality Project. In 2006-2007, he was a Resources for the Future Fellow in Environmental Regulatory Implementation. Also in 2006, Dr. Eisinger was selected as a national air quality expert by the American Association of State Highway and Transportation Officials (AASHTO).