Dr Fok is physician & endocrinologist practising at the Mount Elizabeth Medical Center, Singapore.

He completed his undergraduate medical training at the National University of Singapore, graduating MBBS in 1981.  He attained  the Master of Medicine (Internal Medicine) in 1986 followed by the MRCP (United Kingdom) in 1987, FAMS (Endocrinology) 1990 & FRCP (Edinburgh) in 1998.

From 1989 to 1990, he trained in reproductive endocrinology & andrology in Melbourne, Australia under the tutelage of Professors Henry Burger and David de Kretser at the Medical Research Center Prince Henry's Hospital and Monash Medical Center's Reproductive Biology Laboratory.

Returning to clinical practice at the Singapore General Hospital in 1991, Dr Fok was promoted to Consultant in 1992 and to Senior Consultant in 1996.  In 1995 he was appointed Head of Endocrinology at the Singapore General Hospital, Singapore's largest public hospital.

Dr Fok resigned his appointment as Chief of Endocrinology in 2000 to commence his own practice at the Mount Elizabeth Medical Center.