Peel back the layers of this restaurateur and you'll find more than a bloomin' steakhouse. OSI Restaurant Partners is the #2 casual-dining company in terms of revenue (behind Darden Restaurants) with about 1,000 locations in the US and more than 20 other countries. Its flagship Outback Steakhouse chain offers steak, chicken, and seafood in Australian-themed surroundings. OSI Restaurants also operates the Carrabba's Italian Grill chain, along with Bonefish Grill and Fleming's Prime Steakhouse. Kangaroo Holdings, a group including co-founders Chris Sullivan and Bob Basham and private equity firm Bain Capital, owns the company.