Kelly AuCoin (born February 14, 1967) is an American actor who has appeared in film, television, and theater. He plays "Dollar" Bill Stearn on Billions ( Showtime ), and Pastor Tim on The Americans ( FX ). He has had recurring roles on several other American television series, including Hercules Mulligan on Turn: Washington's Spies ( AMC ), and Gary Stamper on House of Cards ( Netflix ). He frequently appears on stage in New York and venues around the country, such as Manhattan Theatre Club , Signature Theatre , Playwrights Horizons , the Oregon Shakespeare Festival and La Jolla Playhouse . He has had supporting roles in films, including Steven Spielberg's The Post , The Kingdom , Julie & Julia , and All That I Am , which won the SXSW Special Jury Award for Ensemble Acting.