Quazi Tarikul Islam studied Medicine at Rajshahi Medical College and graduated in 1981. He qualified his FCPS in Internal Medicine in July 1987. Dr. Islam served as Consultant of Medicine from 1987 to 1991 at district hospital. He joined as Assistant professor at Rajshahi Medical College in 1991untill 1993 when he left country on lien to Saudi Arabia to serve as Medicine Specialist and worked there up to 1998. After returning back to home he joined at Rajshahi Medical College. In 2003, he was promoted as Associate Professor and in 2007 he became Professor of Medicine and head of the department of Medicine in the same Institute. In 2009 he joined at Dhaka Medical College as Professor of Medicine and retired from job in  2012.  After retirement he joined in Popular Medical College ( Private) as professor of Medicine. Presently he is serving as Professor in the Department of Medicine in the same Institute,  Dhaka , Bangladesh.

 More than 100 postgraduate trainees took clinical training & about 60 dissertations and thesis have been completed under his supervision. He is taking MBBS examination for more than 25 years. He is an Examiner for postgraduates , MCPS, MD, FCPS at home. In 2010 he became External examiner for post graduate Saudi Medical Board exam. He was the external Thesis examiner of AIIMS, India in 2016. During his academic carrier he delivered more than 81 speeches on medical science at local and international conference.  Dr. Islam had been awarded Gold Medal twice in the memorial oration of 2016 and 2017.  He used to talk on medical issues in different TV channels regularly for public awareness.

He attended in many international conferences abroad and presented scientific paper. He has 123 publications in national and international journal in his credit. He held the post of assistant editor, executive editor, editor in chief and chairman of the Editorial board of different journals of Bangladesh and also reviewer of many international journals. He was involved in editorial work for many national guidelines. Dr. Islam is the Editor in Chief of National Guideline for Dengue Fever (3^rd edition) in 2013 and 4^th edition in 2018. He received the fellowship from American College of Physicians in 2004, Royal College of Physicians and Surgeons of Glasgow in 2008, Royal College of Physicians of Edinburgh in 2009 and Mastership of American College of Physicians in 2018 .he is also Fellow of Royal college of London, 2020. He was Councilor, past Controller of examination of Bangladesh College of Physicians and Surgeons. Presently Dr. Islam was the Treasurer of the College. He also served as Regional Technical Adviser in SEARO, WHO for Dengue. He is the past president of Bangladesh Society of Medicine, and Founder Governor of American College of Physicians ( ACP) – Bangladesh Chapter. He is the Executive Member of International Society of Internal Medicine (ISIM) 2018-2020. He is the Overseas regional Adviser of Royal College of Edinburgh, UK. He is the member of International Advisory Board for 24th Edition of Davidson's Principal and Practice of Medicine. He is also a biographer in the Who’s Who in the World in 1995.  

His wife is a Writer. Son is a doctor, who did FCPS in Medicine and MRCP, presently working as Senior Registrar of Medicine in the Royal Free Hospital, London, UK. Daughter is Assistant Professor in the Pharmacy Department, Dhaka University. Did M.Sc from University of Kent , UK.  Presently Studying PhD in Drug discovery at McGill University, Montreal, Canada.