 In 1997, less than a year after Rob Stone founded Cornerstone (a New York-based creative-lifestyle marketing firm with offices in Los Angeles and London which is "charting a new direction for the music industry"), Cohen left Columbia to join Stone as a partner and co-CEO at Cornerstone (which was recognized in 2007 for its integration of musicians in advertising campaigns).Their work with clients such as Converse, Microsoft, Nike, Xbox, Mountain Dew and Diageo has given Cornerstone a reputation as a pioneer in advertising and music.Cohen is a member of the board of directors for Sweetgreen, a farm-to-table salad chain, and helped create the annual Sweetlife Festival concert.