Professor Sen examines the pricing of product bundles, the efficiency of consumer choices, diffusion of innovations, the effectiveness of anti-drug advertising campaigns, and the value of celebrity endorsements. He has served as a consultant to many large organizations, including IBM, DuPont, McCann-Erickson, and Citibank. Professor Sen holds degrees in electrical engineering, industrial engineering, and industrial administration. He has served as editor of Marketing Science, as a member of the advisory board of the Journal of Consumer Research, and as a member of the policy board of Marketing Letters.  He has also served on the board of Harris Interactive.