Mr Chang is a physiotherapist with special interest in geriatric and stroke rehabilitation. Immediately after graduating from Sydney University in 1993, he worked as a travelling physical therapist in the USA.
While working in the skilled nursing facilities in Dallas, Texas ; Indianapolis, Indiana and Okeechobee, Florida, he gained much experience in treating geriatric patients.
Upon returning from the States in 1995, he worked part time with the Singapore Sports Council. There he had treated top national sportsmen and women.
He also started providing house call services in the same year.