De Silva was Board Certified in Sri Lanka as a Specialist in
General Medicine in 1999. He has practised as a Registrar in Gastroenterology and
Research Fellow at
Radcliffe Infirmary Oxford during his professional training. In 2001 he was awarded
MRCP from the
Royal College of Physicians London. De Silva was subsequently appointed Consultant
Physician (Resident Physician) at the
National Hospital of Sri Lanka. He has also worked at the
Ampara Hospital as a Consultant Physician. In 2008, de Silva was appointed a Board Certified as a trainer in Gastroenterology. He was awarded FCCP 2009 and became a Fellow of the
Royal College of Physicians (
FRCP, London) in 2010. De Silva is a
Professor in
Medicine at the Faculty of Medicine,
University of Kelaniya and has previously held the positions of
Senior Lecturer in Medicine and Clinical Coordinator at the same university. He was appointed Head, Department of Medicine,
Faculty of Medicine,
University of Kelaniya in 2013. De Silva currently holds several advisory positions for the
Government of Sri Lanka and is the Chairman of the Sri Lanka Anti-Doping Agency (SLADA). He was formerly the Director General Institute of Sports Medicine Sri Lanka. ==Sports medicine==