Mark Cuban (born July 31, 1958) is an American businessman and investor. He is the owner of the National Basketball Association (NBA)'s Dallas Mavericks, co-owner of 2929 Entertainment and chairman of AXS TV. He is also one of the main "shark" investors on the ABC reality television series, Shark Tank. In 2011, Cuban wrote an e-book, How to Win at the Sport of Business, in which he chronicles his experiences in business and sports..