Mr. Mahibul Islam Chowdhury did his M. A. in History from the University of Dhaka and M.S. in Agricultural Extension Programme from the University of Wisconsin, Madison, U.S.A. He joined the Govt. Services of the then Pakistan and continued his services in Bangladesh also for long 33 years. He served the Country in various capacities and was appointed as the Secretary, Ministry of Information in the year 1999, Later he was appointed as the Secretary, Ministry of Land and served the position till his retirement in the year 2002.

Mr. Islam was awarded a Gold Medal of Honour by 'The American Biographical Institute' for outstanding performance to develop the Socio-Economic condition of the poor people of Bangladesh. He was also Awarded Presidential Gold Medal for his contribution to develop the rural infrastructure in Bangladesh in 1978.

After his retirement, he took over as an Executive Director of Silver Line Group and served there till December, 2010. Presently, he is the Chairman, Managing committee of Rajdhani Mohila College, Rupnagar, Mirpur, Dhaka, Advisor- E.N.T Foundation & Cancer Hospital, Dhaka and Sylhet Automatic Brick Ltd.

He has been an Independent Director of DBH, since December 2012.