As a social entrepreneur, Jill Vialet co-founded the Museum of Children's Art (MOCHA) in Oakland, California and, more recently, founded Playworks, a recess and after school physical activity program. With the conviction that “play is a precious commodity,” she declares, “When recess is bad, it infects the entire school day. But a vibrant recess is like grease for a school's gears. It makes everything else go more smoothly.”