The ‘How Does a Debate Moderator Work?’ Edition

John Donvan has made a career out of staying calm and staying on topic. A veteran ABC News correspondent, he’s now the moderator of Open to Debate formerly known as Intelligence Squared U.S., a series of Oxford-style debates on the most controversial issues of the day. In this week’s episode, Donvan tells Aisha Harris why a successful debate starts with a good question and why a moderator must learn the art of interruption.