H.N. Sarker (Harendra Nath Sarker) is a Professor of Medicine in Sher-e-Bangla Medical College, Barisal, Bangladesh. He obtained MBBS in 1984, FCPS in Internal Medicine in 2004 from Bangladesh College of Physicians and Surgeons of angladesh, MRCP in 2011 from the Royal College of Physicians, UK, FRCP(Edin) in 2013 and MRCP (Neurology) in 2016. He has been serving as a teacher since 1995 in different medical colleges as Registrar, Assistant Professor, Associate Professor and Professor. He is an examiner of undergraduate and postgraduate examinations. He authored six medical books and has more than 50 publications in national and international journals.