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| May 06 - date | Reader | Tata Institute of Fundamental Research, Centre for Applicable Mathematics, Bangalore, India |
| Dec 05 - Apr 06 | Visiting Scientist | Tata Institute of Fundamental Research, Centre for Applicable Mathematics, Bangalore, India |
| Jan 05 - Dec 05 | Visiting Assist. Prof. | Harvey Mudd College, Math Dept. and Quantitative Life Sciences Centre, Claremont, CA, USA |
| Nov 03 - Jan 05 | Post-doctoral Research Assoc. | University of Tennessee, Dept. of Mathematics and Dept. of Ecology and Evolutionary Biology, Knoxville, TN, USA |
| May 98 - Aug 99 | Adjunct Associate Prof. | Courant Institute of Mathematical Sciences, New York University, NY, USA |
| May 98 - Aug 98 | Assoc. Visiting Scientist | Courant Institute of Mathematical Sciences, New York University, NY, USA |
| Aug 92 - May 98 | Lecturer & Teaching Assistant | Courant Institute of Mathematical Sciences, New York University, NY, USA |
| Jan 01 - Sept 03 | Independent Investor and Entrepreneur | Money and Portfolio Management, Los Angeles, CA, USA |
| Dec 00 - Jan 01 | Vice President | Quantitative Research Group, Lehman Brothers, New York, NY, USA |
| Aug 98 - Dec 00 | Associate | Reinsurance and Quantitative Research, Lehman Brothers, New York, NY, USA |