Thirty-two years of service under the Ministry of Health Bangladesh in different capacities: Assistant Surgeon, Chittagong Medical College Hospital 1978 – 1979 and Successively Consultant Medicine, Cox’s Bazar District Hospital and Chittagong Medical College Hospital 1982 – 1988; Assistant Professor Medicine, Institute of Post Graduate Medicine and Research Dhaka 1988 – 1993; Associate Professor and Professor of Medicine, Chittagong Medical College 1993 – 2003; Professor and Head of Medicine, Principal, Dhaka Medical College and Dean, Faculty of Medicine, University of Dhaka, Director General of Health Services (DGHS, Govt. of Bangladesh) 2008 – 2009; Professor and Head of Medicine, Sir Salimullah Medical College & Mitford Hospital 2009 – 2010.