Originally, the concept of PokerStars was founded by Israeli entrepreneur Mark Scheinberg and his father Isai. Together, they developed the PokerStars brand into the world’s largest online poker room. The site operated under the umbrella of Costa Rican company Rational Enterprises until June 2014. That summer, The Stars Group – formerly known as Amaya Inc. – purchased PokerStars and its parent company for $4.9 billion.