#17. Mark Scheinberg
Major holdings: PokerStars
New to the list, Scheinberg owes his fortune to online gambling. In 2001, his father, Isai, founded PokerStars in Montreal. He soon moved the company to Costa Rica, where Mark joined him. PokerStars, which eventually moved to the Isle of Man, quickly became the world’s largest online poker company by ensuring its customer service and software were superior to its competitors’—and by continuing to accept American players in 2006, when the U.S. government cracked down on online gaming. That choice earned Isai a criminal indictment in 2011. This year, the Scheinbergs sold the company to Toronto-based Amaya Gaming for $4.9 billion. With Isai still under indictment, the sale and change of ownership is necessary for PokerStars to enter U.S. markets where online gambling is now legalized.