George Bruce Kaiser (born July 29, 1942) is an American billionaire businessman. He is the chairman of BOK Financial Corporation in Tulsa, Oklahoma. As of 2026, he was the 177th richest person in the world with an estimated net worth of $16 billion. He attended Central High School in Tulsa. He earned a BA from Harvard College in 1964 and an MBA from the Harvard Business School in 1966. He briefly considered joining the U.S. Foreign Service, but instead returned to Tulsa in 1966 to work for his father. Kaiser-Francis Oil Co. was created in the 1940s by Kaiser's uncle and parents, Jewish refugees from Nazi Germany who settled in Oklahoma.
George's father, Herman George Kaiser, had been an attorney in the district of the Kammergericht in Berlin until 1933, when he was dismissed by the Nazis because he was Jewish. He and his wife Kate then moved to Rostock where Herman Kaiser worked with his father-in-law Max Samuel's EMSA-Werke company. Herman Kaiser escaped to England in 1937 and his wife and daughter came over in September the following year. In 1940 all three emigrated to the United States. They settled in Tulsa, where Herman's aunt and uncle already lived. Herman joined the uncle's oil drilling business. Their son was born in Tulsa.
Career
Oil and gas
Kaiser took control of Kaiser-Francis Oil Company in 1969, after his father had a heart attack. Kaiser-Francis was a little-known, privately owned oil prospecting and drilling company at the time. Under George's management, it became the 23rd largest nonpublic energy exploration company in the U.S. by 2010. In that year the company earned about $217 million, based on estimates by Bloomberg News.
Banking
In 1990, Kaiser bought Bank of Oklahoma out of Federal Deposit Insurance Corporation receivership. Despite BOK's depressed state, it was rich enough to land Kaiser on the Forbes 400 at one stroke. He has since expanded BOK from a 20-branch company located solely in Oklahoma into a $23.9 billion bank with operations in nine states. He owns 61.5 percent of BOK. As of 2023, George's net worth was estimated at $13.3 billion.
Professional sports
In April 2014, Kaiser bought Tom L. Ward's interest in the Professional Basketball Club, the investment group headed by Clay Bennett that owns the Oklahoma City Thunder of the National Basketball Association, as well as its Oklahoma City Blue minor league affiliate.
Personal life
Kaiser's nephew is actor Tim Blake Nelson.
Kaiser's first wife was Betty Eudene, a prominent literacy advocate. Betty died in 2002. The couple had three children: Philip, Leah and Emily. They also have five grandchildren: Shai, Eytan, Aidan, Ilan, and Ben. The couple divides their time between Tulsa, Oklahoma, and San Francisco, California.
Kaiser is affiliated with the Egalitarian Conservative Congregation B'Nai Emunah.
George Kaiser Family Foundation focuses on early childhood education, economic and community development, maternal and child health, public and charter schools, and criminal justice programs.
Political activities
A Wall Street Journal article reported in 2004 that campaign contribution records showed that Kaiser had donated $10,000 to Democratic Party political candidates for every $1,000 that he gave Republican Party candidates.