Sarah Treem is a television writer, producer and playwright. Treem is the co-creator and showrunner of the Golden Globe-winning Showtime drama The Affair. Previously, Treem was a co-executive producer on the inaugural season of House of Cards. She also wrote on all three seasons of HBO's In Treatment. Treem began her career writing for theater. Her plays When We Were Young and Unafraid, A Feminine Ending, The How and the Why and Mirror Mirror have been produced multiple times over and published by Samuel French and the Dramatists Play Service.