S.N. Medical College, Agra, Jun 1963 - Jan 1964, Royal Victoria Hospital, Belfast, U.K., Apr 1964 - Aug 1969, PGIMER Chandigarh, Sep 1969 - Oct 1998, Government Medical College Chandigarh, Aug 1995 - Oct 2000, Emeritus Professor, PGI Chandigarh, since Apr 2000