Amy Costello is a former Africa correspondent for PRI’s The World. She now hosts Tiny Spark, a podcast that investigates the business of doing good. Tiny Spark takes a critical look at seemingly good ideas and asks tough questions of well-intentioned people and programs, whether medical volunteers in post-quake Haiti or the social entrepreneur behind TOMS Shoes. Amy has worked as an NPR producer and adjunct professor at Columbia University Graduate School of Journalism, her alma mater. Her FRONTLINE/World television investigation “Sudan: The Quick and the Terrible” was nominated for an Emmy Award.