Stephen Michael Kunken (born April 30, 1971) is an American actor. He is known for the roles of Ari Spyros on Showtime's Billions and Commander Putnam on Hulu's The Handmaid's Tale. His film work includes work with Martin Scorsese, Steven Spielberg, Woody Allen, Paul Greengrass, Ang Lee, Barry Levinson, Ron Howard and others. Graduating with top honors from The Juilliard School Kunken has an extensive and celebrated theater career appearing on Broadway in 7 different Productions and countless off-Broadway and Regional productions. He is most readily known for playing Andy Fastow in the Broadway play Enron, for which he received a Tony Award nomination for Featured Actor in a Play. Other Broadway credits include Frost/Nixon and Rock 'n' Roll'.