Susan Thompson Buffett (June 15, 1932 – July 29, 2004), the first wife of investor Warren Buffett, was active in civil rights, abortion rights and population control causes. She was a director of Berkshire Hathaway, owning 2.2 percent (worth US$3 billion in 2004) of the company at the time of her death. She was the 153rd richest person in the world. She was president of the Buffett Foundation, which has contributed millions of dollars to educational groups, medical research, population-control groups and other charities.
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