Faber made her Broadway debut on December 26, 2005, replacing Stephanie D'Abruzzo in the musical Avenue Q as Kate Monster and Lucy T. Slut.

She helped to develop the character of Natalie in Feeling Electric (which would eventually be redeveloped into the Pulitzer Prize-winning Next to Normal).

[1] Faber originated the role of Heather in the musical American Idiot while the show was being developed at Berkeley Repertory Theatre.

[4] She starred as Smitty in the 2011 revival How to Succeed in Business Without Really Trying alongside Daniel Radcliffe and John Larroquette, from the opening of the run until February 26, 2012.

[citation needed] Faber had a recurring role on Parks and Recreation as Pawnee restaurant lobbyist Kathryn Pinewood and has also made guest appearances on Nurse Jackie and The Good Wife.