- C. Carlisle and Margaret Tippit Class of ’42 Professor of Statistics, Department of Mathematics and Statistics, Williams College, Williamstown, Massachusetts, July 1, 2013 – presnet.
- Professor, Department of Mathematics and Statistics, Williams College, Williamstown, Massachusetts, July 1, 2001- June 30, 2013.
- Visiting Research Associate, Institut National de la Recherche Agronomique (INRA), Jouy-en-Josas, France, 2009-2010.
- Kenan Invited Professor of Distinguished Teaching, Department of Operations Research and Financial Engineering (ORFE), Princeton University, Princeton, New Jersey, 2006-2007.
- Visiting Professor, MAP5, Université Paris Descartes, Paris V, Paris, France, 2005-2006.
- Associate Professor, Department of Mathematics and Statistics, Williams College, Williamstown, Massachusetts, 1997-2001.
- Visiting Research Associate, Biostatistics Group, Institut National de la Recherce Agronomique (INRA), Montpellier, France, 1997-1998.
- Assistant Professor, Department of Mathematics, Williams College, Williamstown, Massachusetts, 1994-1997.
- Senior Lecturer, Department of Civil Engineering and Operations Research, and Chairman, Committee for Statistical Studies, Princeton University, Princeton, New Jersey, 1992-1994.
- Assistant Professor, Department of Civil Engineering and Operations Research, Princeton University, Princeton, New Jersey, 1986-1992.
- Richard Dicker Assistant Professor of Statistics, Department of Statistics, The Wharton School, University of Pennsylvania, Philadelphia, PA 1985-86.
- Lecturer, Department of Statistics, The Wharton School, University of Pennsylvania, Philadelphia, Pennsylvania, 1984.
- Research Associate, Analysis Center, The Wharton School, University of Pennsylvania, Philadelphia, Pennsylvania, 1980-1983.
- Statistician, University of Utah Computer Center, Salt Lake City, Utah, 1979-1980.
- Statistician, Center for Advanced Study in the Behavioral Sciences, Palo Alto, California, 1977-1978.