For the first time in nearly a decade, businessmen and oil tycoon T. Boone Pickens was dropped from the Forbes 400 list of richest Americans.
The energy magnate is estimated to now be worth about $950 million, according to Forbes. The magazine estimates Pickens' net worth once reached $2 billion.
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Pickens is an Oklahoma native who made the majority of his fortune in the oil business. The millionaire has donated half of a billion dollars to his alma mater of Oklahoma State University and is an advocate for U.S. energy independence.
For the 20th consecutive year, Bill Gates is America's richest man. Warren Buffet follows in second.