He attended Forest Lake High School and, after graduating, set out for
New York to study acting at the American Musical and Dramatic Academy.
Sieber made his television series debut in
Two of a Kind (1998). In regional
theatre, he has been involved in a string of world premiere musicals,
including
Randy Newman's "Faust" at La Jolla Playhouse, Bill C. Davis and
Richard Adler's "Off-Key" at the George Street Playhouse and
Larry Grossman's
"Paper Moon" at Papermill Playhouse. For television, he has appeared in
numerous commercials and in the daytime dramas,
All My Children (1970) and
Another World (1964).