· Chief Economist, U.S. Department of Justice Antitrust Division2022–2024
· The Economics of Technology Professor, Stanford University Graduate School of Business2014–
· Professor of Economics, Harvard University2006–2012
· Holbrook Working Professor of Economics, Stanford University2004–2006
· Associate Professor of Economics, Stanford University2001–2003
· Castle Krob Career Development Associate Professor of Economics, Massachusetts Institute of Technology (MIT)1998–2001
· Assistant Professor of Economics, Massachusetts Institute of Technology (MIT)1995–1997
· PhD, Economics, Stanford University Graduate School of Business1991–1995
· BA, Economics, Computer Science, and Mathematics, Duke University1987–1991