Research Associate, Michigan State and Ohio State Universities, USA, 1967 - 69.

Lecturer and Assistant Professor, Indian Institute of Technology, Kanpur, 1969 - 77.

Professor, University of Hyderabad, Hyderabad, India, 1977 - 98, Founder Dean 1977 - 86.

Vice-Chancellor, University of Hyderabad, Hyderabad, India, 1994 - 98.

Visiting Professor, Michigan State University, USA, 1982.

Visiting Professor, University of Notre Dame, USA, 1990.

Honorary Professor, Jawaharlal Nehru Center for Advanced Scientific Research, India, 1990 -

Visiting Professor, University of Joseph Fourier, Grenoble, France, 1991.

Visiting Professor, Chemical Research Centre, Taiwan, 1994.

Humboldt Forschungspreis Awardee, University of Freiburg, Germany, 1995.

Srinivasa Ramanujan Research Professor, Indian National Science Academy, 1992 - 97.

Professor, Department of Organic Chemistry, Indian Institute of Science, 1998 - 2005.

Director, Indian Institute of Science, Bangalore, 1998 - 2005.

Merck Visiting Professor, University of Nottingham, UK, 1998.

Visiting Professor, Ecole Normale Superiere de Chimie, Paris, France, 1999.

Humboldt Forschungspreis Awardee, University of Heidelburg, Germany, 2000.

Tarrant Distinguished Visiting Professor, University of Florida, Gainesville, USA, 2001.

Distinguished Visiting Professor, Kyoto Institute of Technology, Kyoto, Japan, 2002.

Mercator Professor, Deutsche Forschungsgemeinschaft (DFG), Germany, 2003, 2005.

Honorary Fellow, Indian Association for the Cultivation of Science (IACS), Kolkata, 2005