Martua Sitorus started his business career as a palm oil trader in Indonesia, and Singapore. In 1991 Martua success to have his own oil palm plantation area of 7100 hectares in North Sumatra. In the same year, Martua Sitorus could build a plant palm oil processing.
He then spread his wings with the flag of Wilmar International Limited. Largest agribusiness companies in Asia, is a public company listed on the Singapore Stock Exchange. In fact, for the biodiesel plant, he has the world's largest production. Although as the owner, Martua still served as executive director of Wilmar.
Meanwhile, Bill Gates, The Microsoft Tycoon, is no longer the richest man in the world. After for the 16 years he held the title, now he was dethroned by Carlos Slim. Carlos Slim is a Mexican telecommunications businessman, who has an estimated annual income of $500 million more than Bill Gates.
Other famous people who included in the list of world's richest people are, Oprah Winfrey with $2.4 billion, Donald Trump with $2.00 billion, and the designer Ralph Lauren with $4.6 billion.