Kartheiser's stage credits include Slag Heap Off-Broadway, as well as such Children's Theatre Company productions as The Velveteen Rabbit, Pippi Longstocking, Our Town, Treasure Island, The 500 Hats of Bartholomew Cubbins, and Rebecca of Sunnybrook Farm. His television and film credits include Mad Men, Angel, Untamed Heart, Alpha Dog, Another Day in Paradise, and the forthcoming Now.

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