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May 2007 - present
| Financial Markets Group
Research Associate, London School of Economics
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July 1996 - present
| Reader in Economics, London School of Economics
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April 1995 - June 1997
| Research Scholar, Cowles Foundation, Yale University
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September 1994 - June 1996
| Visiting Associate Professor of Economics, Columbia University
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July 1991 - June 1995
| Associate Professor of Economics, Yale University
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July 1985 - June 1991
| Assistant Professor of Economics, Yale University
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Fall 1983
| Teaching Assistant, M.I.T.
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