| Teaching Assistant | Purdue University, West Lafayette, USA | 1984-1985 |
| Research Assistant | Purdue University, West Lafayette, USA | 1986-1987 |
| Teaching Assistant | Purdue University, West Lafayette, USA | 1987-1989 |
| Lecturer | Indian Institute of Technology, Bombay India | 1989-1990 |
| Assistant Professor | Indian Institute of Technology Bombay, India | 1990-1997 |
| Associate Professor | Indian Institute of Technology Bombay, India
| 1997-2003 |
| Professor | Indian Institute of Technology Bombay, India
| 2003-present |
| Head, Dept. of Mathematics | Indian Institute of Technology Bombay, India
| Dec 2012-Dec 2015 |
| Institute Chair Professor | Indian Institute of Technology Bombay, India
| May 2014-May 2020 |
| Professor (HAG Scale) | Indian Institute of Technology Bombay, India
| Jan 2014 -present |
| Dr. K. V. Ramachandran Chair Professor | Indian Institute of Technology Bombay, India
| Aug 2023 -present |
| Institut de Mathématiques de Luminy, Marseille, France |
Oct-Nov 1996, Apr-June 1998 and May-July 2001 |
| Tata Institute of Fundamental Research, Mumbai, India |
December 1996 |
| Université de la Mediterrannée, Aix-Marseille, France |
May-June 1999 and May 2003 |
| Christian-Alberchts-Universität zu Kiel, Germany |
December 2000 and July 2002 |
| Purdue University, West Lafayette, USA |
Spring 2004 |
| University of Tennessee, Knoxville, USA |
Fall 2005 |
Technical University of Denmark, Lyngby, Denmark |
May - July 2010 |
Université de Toulouse Le Mirail, Toulouse, France |
May 2012 |
Tulane University, New Orleans, Louisiana, USA |
March-April 2023 |