More than 20 years' service in Atomic Energy Commission (1961-1982) in different important posts; Director, Atomic Energy Centre, Dhaka, Bangladesh (1970-1978)

Service in Dhaka University (1982 - 2006) as Professor of Physics. Subjects taught included Quantum Mechanics, Nuclear Physics, Mathematical Methods of Physics, etc.

(Associate, Senior Associate and Honorary Associate of the Abdus Salam International Centre for Theoretical Physics, Trieste, Italy, 1966 -

Founder Vice-Chancellor, Bangladesh Open University (1992 – 1996)

Founder Vice-Chancellor, Bangladesh Open University (1992 – 1996)

Vice-Chancellor, Southeast University (2002 - )

President, Bangladesh Academy of Sciences (2004 - )
Visited and worked in a number of research institutions in Europe and America.