In his early career, Widjaja did various business, including trading cooking oil and agricultural products, coffee shop, pig rearing, bakery, and grave construction. During
Japanese occupation, price controls devastated his cooking oil business. When
Indonesia's war for independence against the Dutch crushed his commodity-trading business in 1949, he sold family jewelry to repay creditors and traded in his car for a bicycle. In the same year, he started Duta Pertiwi, a property developer and real estate business. Also in 1982, Widjaja acquired
Bank Internasional Indonesia (BII) and founded PT Internas Artha Leasing Company. but due to the
1997 Asian financial crisis, it failed in April 1998 with a debt of US$4.6 billion (the largest foreign debt owed by an Indonesian corporation at that time) and was
nationalized in April 1999. In 1990, Widjaja received an honorary doctorate from
Pittsburg State University in
Pittsburg, Kansas, United States. By the mid-1990s, Widjaja's best-known asset was a controlling stake in
Asia Pulp & Paper (APP), a Singapore-based company listed on the
New York Stock Exchange and the 10th-largest paper company in the world. APP has also been convicted of being involved in
illegal logging in Cambodia,
Yunnan Province,
China, destroying ancient rainforest and the illegal felling of over 50 thousand acres (200 km2) of forest in
Bukit Tigapuluh national park. As of 2003, Widjaja lived primarily in Singapore and had turned over day-to-day control of his businesses to his extensive family. ==Personal life and family==