Who is the American oil tycoon?

American oil tycoon: Charles Koch.

Charles Koch (November 1, 1935 -), American entrepreneur, oil magnate and rich man. He is the chairman and CEO of the American Koch Industries Group. In 2012, his personal assets reached US$25 billion, ranking him 12th on the Forbes list of the world's richest people. His younger brother David Koch is also a rich man. Koch Industries is the world's second-largest privately held company after Cargill of the United States and the world's largest unlisted company. Its businesses include petroleum, energy, chemicals, wood, etc. The refineries owned by the Koch brothers are spread across Alaska, Texas, Minnesota and other places, bringing them a steady stream of wealth.