The authors thank Janet Bercovitz, Ethan Bernstein, Russ Coff, Craig Crossland, David Kryscynski, Joseph Mahoney, Mario Schjiven, Deepak Somaya, Olav Sorenson, Michael Toffel, and seminar audiences at the Sumantra Ghoshal Conference, the Wharton Business School, and the University of Washington at St. Louis. The authors also thank the editor and three anonymous reviewers for their comments and advice on this paper, and Katie Moore for editorial help.