1. Associate Scientist & Head, Acute Respiratory Infection Unit, Dhaka Hospital, Nutrition and Clinical Services Division (NCSD), International Centre for Diarrheal Disease Research Bangladesh (icddr,b)
2. Senior Medical Officer, ICU, Dhaka Hospital, NCSD, icddr,b
3. Project Research Physician, NCSD, icddr,b
4. Study Physician, NCSD, icddr,b
5. Assistant Scientist, NCSD, icddr,b
6. Senior Director and Senior Scientist, NCSD, icddr,b
7. Senior Scientist & Clinical Lead, ICU, Dhaka Hospital, icddr,b