Began career as computer programmer in U.K., where he studied. Returned to Indonesia in 1977 to start business supplying pipes for construction; became Citramas group. Also has stake in Singapore-listed energy services company KS Energy. President of the Asian Tae Kwon Do Association and Indonesian sailing association Riau Porlasi. Also owns a Nicklaus-designed golf course. Son Michael is a filmmaker.
To compile this list we looked at shareholdings in publicly traded companies as well as in private company filings. For people with publicly traded fortunes net worths were calculated using current share prices and exchange rates. For privately held fortunes we estimated what they would be worth if public.