- Performing opposite 'Tim Curry', David Hyde Pierce, Hank Azaria and others in Broadway musical "Monty Python's Spamalot" and will feature on the soundtrack, released in May. (February 2005)
- Has appeared on LOGO television as a supporter of gay rights; in several interviews during production of 'It's All Relative (2003)', Sieber came out as gay and identified his partner as actor/chef Kevin Burrows, whom he met while both were performing in the Broadway production of 'Beauty and the Beast (1991)'.
- Appearing on Broadway as lawyer, Billy Flynn in "Chicago" until August 1st. (July 2004)
- He is in New York performing in Monty Python's Spamalot. (May 2005)
- Appearing on Broadway as Trevor Graydon in the 2002 Tony Award Winning Musical "Thoroughly Modern Millie." (April 2003)
- Appeared in the concert version of 'Hair' along with Jai Rodriguez, Annie Golden of the movie, and others. (2004)
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