Ross School of Business, University of Michigan. Previously, he was a lecturer in the Department of Management & Organizations, Kellogg School of Management, Northwestern University. His research focuses on the origins and evolutionary dynamics of the dual social structure of markets that encompasses both collaborative and conflictual interorganizational relationships. He also investigates how network positions of firms determine their behavior and performance; and the role of varying global network topologies in shaping performance consequences for entire communities of firms.