It is with great sadness that we announce the passing of Dr. David Hartgen, Professor Emeritus. From 1989 to 2006, Hartgen was Professor of Transportation at the University of North Carolina at Charlotte. While here, he established the University's interdisciplinary transportation studies center and conducted numerous studies of transportation systems throughout the nation. He conducted extensive assessments of congestion, road condition, growth and transit service on North Carolina, with particular focus on Charlotte. He was widely known nationally for his continuing series of reports on the comparative performance of road and transit systems, sprawl and growth, economic impacts and air quality. In 2007, Hartgen opened a consulting company, The Hartgen Group, specializing in studies of congestion, system performance, climate change, and other issues for private and public clients.