About David T. Scheffman David T. Scheffman is the Managing Director of Berkeley Research Group. He is a scholar of economics and has over 12 years of experience in a number of senior positions at the U.S. Federal Trade Commission's Bureau of Economics. Books by David T. Scheffman An Economic Analysis of the Impact of Oil Prices on Urban Structures by (author) James R. Melvin & David T. Scheffman Social Regulation in Markets for Consumer Goods and Services by (author) David T. Scheffman & Elie Appelbaum Speculation and Monopoly in Urban Development Analytical foundations with evidence for Toronto by (author) J.R. Markusen & David T. Scheffman