Christopher Sieber started performing shows in his parents’ living room, where he was a triumph at age 7 in “The Christopher Comedy Cavalcade of 1976,” seen by both his parents and unsuspecting neighbors driving by. Then he went immediately to Broadway, where he has been for almost three decades. He has starred in Company, The Prom, Matilda, Pippin, La Cage aux Folles, Shrek (Tony, Drama Desk, Drama League, Outer Critics noms), Monty Python’s Spamalot (Tony nom and West End Production), Chicago, Thoroughly Modern Millie, Into the Woods, Beauty and the Beast, and Triumph of Love. Television: Blue Bloods, Law and Order: SVU, The Good Wife, The Good Fight, Elementary, Ed, Sex and the City, Pushing Daisies, It’s All Relative, Two of a Kind, and lots of daytime TV, like Guiding Light, All My Children, and Another World, where his many recurring characters never went anywhere…