University Professor (one of 24), Harvard. Research Fellow, NBER. Faculty Co-Director, HBS's Initiative for Business and the Environment. Research focused on the economics of innovation and the challenges large firms encounter in attempting to shift strategic direction. Member of the Baord: Amgen; Idexx. Recent publications include: Accelerating Energy Innovation: Insights from Other Sectors; What Do Managers Do? Exploring Persistent Performance Differences among Seemingly Similar Enterprises.