Chang has been in the ship building industry since 1967, founded CIMC Raffles Offshore (Singapore) Ltd. in 1994.
In 2008 China International Marine Containers (CIMC) offered USD 560 million for a 30 percent stake. But later this deal was canceled, buying only 10% for a small part of the original price.
In 2008 Forbes estimated his net worth at USD 560 million, but later this was reduced to USD 100 million. In 2013 CIMC acquired all shares in Raffles.
The yacht Asean Lady is the only yacht in the world based on a proa design. A proa has been used for more than 2,000 years for fishing crafts throughout the Pacific region.