Vukan R. Vuchic is UPS Foundation Professor of Transportation Engineering and professor of city and regional planning at the University of Pennsylvania. He has served as a consultant to scores of companies, public agencies, and city governments around the world: Belgrade in his native Yugoslavia; Edmonton and Toronto, Canada; Lima, Peru; Rome, Italy; and in the United States for the cities of New York and Philadelphia, among others. His other books include Urban Transit Operations, Planning and Economics, and Urban Transit Systems and Technology.