2018 - present
| Senior Professor, Department of Physics and Astrophysics, University of Delhi, Delhi
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2002 - 2018
| Professor, Department of Physics and Astrophysics, University of Delhi, Delhi
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2016 - 2019
| Head, Department of Physics and Astrophysics, University of Delhi, Delhi (Nov 2016 - Dec 2019)
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2016
| Addie & Harold Broitman Member, Simons Center for Systems Biology, Institute for Advanced Study, Princeton, USA (Sept 2016 - Oct 2016)
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2016
| Member, Institute for Advanced Study, Princeton, USA (Jan 2016 - Aug 2016; on sabbatical leave from University of Delhi)
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2000 - 2004
| Associate Professor, Centre for Theoretical Studies, Indian Institute of Science, Bangalore
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1999 - 2000
| Visiting Professor, Santa Fe Institute, Santa Fe (on sabbatical leave from University of Delhi)
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1992 - 2000
| Assistant Professor, Centre for Theoretical Studies, Indian Institute of Science
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1990 - 1992
| Research Associate, Physics Department, Harvard University
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1987 - 1990
| Research Associate, Physics Department, Brown University
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1981 - 1987
| Research Scholar, Tata Institute of Fundamental Research, Mumbai
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