Lockhart Steele is the founder of Eater.com (with Ben Leventhal), Curbed.com, and Racked.com—and, after selling the group of sites to Vox Media in 2013, is now Vox’s editorial director. I sat him down to learn about how obsessions—his and his readers’—helped turn a restaurant gossip site into a multimillion-dollar business. —Brette Warshaw