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- Associate Prof. , Dept. of Comp. Sc., IIT Delhi, Jan. 1994- present.
- Asst. Prof., Dept. of Comp. Sc., IIT Delhi, Feb. 1988- Jan. 1994.
- Visiting Asst. Prof., Dept. of Comp. Sc., IIT Delhi, July 1987 - Jan. 1988.
- Bell Labs, Murray Hill, New Jersey, U.S.A., Post Doctoral Member of Staff, Sept. 1986 - June 1987.
Visiting researcher at Max-Planck Institute fur Informatik, Germany,
June- July 1993,
June- July 1994,
Sept- Dec 1995,
May- July 1996,