A strapping blond actor-singer, Christopher Sieber may be best-known to TV viewers for his one-season stint playing single dad to the Olsen twins on the ABC sitcom "Two of a Kind" (1998-99). Discerning theatergoers, however, may know him better from his stage work in comedies and musicals.<p>The native Minnesotan landed in NYC after high school to attend the American Musical and Dramatic Academy. He soon began to land small roles in musicals like the 1993 premiere of "Paper Moon" at New Jersey's Paper Mill Playhouse and as Young Jacob Marley in the Madison Square Garden annual presentation of "A Christmas Carol" in 1994. The following year, he landed the lead in the George Street Playhouse production of "Off-Key". Although playing essentially an unsympathetic character (an embezzler who faked his own death), Sieber brought charm and conviction and made the character's journey to redemption believable. Undoubtedly he was cast, in part, in his next role -- the Angel Rick in Randy Newman's "Faust" -- because of his corn-fed Midwestern looks but his stage presence proved he was more than a pretty face.<p>Sieber stretched his acting chops in 1996 when he assumed the role of Donald, the conscience of the show, in a well-received Off-Broadway revival of Mart Crowley's landmark gay play "The Boys in the Band". Over the next year-and-a-half the actor-singer was perfecting his comic portrayal of the prince in the uneven but enjoyable stage musical "The Triumph of Love", originating the part at Yale Rep and recreating it in Baltimore before landing on Broadway. While he easily could have been overshadowed by such heavyweight co-stars as F Murray Abraham, Betty Buckley and Susan Egan, Sieber managed to hold his own, putting his own unique stamp on the character that easily could have been the most uninteresting. Having reigned on Broadway (albeit briefly), he moved to the small screen to essentially play second banana to Mary-Kate and Ashley Olsen as a widower college professor struggling with pre-teen twins in the genial if sometimes treacly comedy "Two of a Kind". While the show was highly touted and given the anchor spot for ABC's "TGIF" block of programming, it proved a ratings bust and was cancelled after a year. Sieber quickly returned to the stage playing a gay man seeking to have a marriage ceremony in a Catholic church in the Off-Broadway play "Avow" (2000).