MARK LINN-BAKER (Tony Ellis). Broadway: Frog and Toad, Hysterium in Forum, Laughter on the 23rd Floor, Face Value, Doonesbury. Encores!:  Pajama Game. NYSF: All's Well That Ends Well, Othello, Von Richthofen, Laundry Hour, Alice in Concert. Off-Broadway: Chesapeake, Flea in Her Ear, Miss Firecracker Contest. Regional: Yale Rep, ART Cambridge, Arena, Center Stage. Film:  Manhattan, My Favorite Year, Noises Off, Laughter on the 23rd Floor. Television: "Perfect Strangers";  “Twins”; "Ally McBeal," "Law & Order," "Spin City," "Sesame Street," "Miami Vice," "Moonlighting."