Ee Koon graduated in Medicine from the University of Singapore in 1972. He obtained his post-graduate qualifications in Anaesthesia from the Royal Colleges in Ireland (FFARCS) and Australasia (FFARACS, FANZCA) in 1976 and 1977. He was in public service till 1987, his last post was that of being Consultant Anaesthetist & Head of Anaesthesia at Alexandra Hospital. He has been in private practice in Anaesthesia since then.
During his stinct in public service, he was sent on fellowship training to USA and Canada. He keeps himself fit by going for regular runs and going to the gym.