Mark Shanahan is  writer/director of The New York Times Critics’ Pick A Sherlock Carol (Off-Broadway Alliance nomination, Best New Play 2021), currently playing across the United States, annually at London’s Marylebone Theatre and returning to the Playhouse stage this season. He is the author of the stage adaptation of Agatha Christie’s The Murder of Roger Ackroyd, in partnership with Agatha Christie Ltd., as well as  A Merry Little Christmas Carol, See Monsters of the Deep, the Off-Broadway and regional hit comedy The Dingdong. Shanahan has directed at numerous stages  including  Alley Theatre, George Street Playhouse, Virginia Stage, Arkansas Rep, White Heron, Mile Square Theatre, Hudson Stage, Theatre Squared, Fulton Theatre, Weston Playhouse, Orlando Shakespeare Festival, Florida Rep, Penguin Rep, Merrimack Rep, The Cape Playhouse, and many more. As an actor, he has appeared  numerous times on the Playhouse stage, as well as on and Off-Broadway (The 39 Steps, Tryst, The Shaugraun, Small World, Checkers, As Bees In Honey Drown and others) and at many celebrated regional theatres. He has appeared in Kill Me (co-writer, Adirondack Film Fest finalist), “All My Children” and on “The Late Show with David Letterman.”