Hiller started performing improv comedy with the
Upright Citizens Brigade Theatre in 2001 where he was part of the improv teams People People, The Scam, Creep, Rumpleteaser and Police Chief Rumble. He taught improv comedy for a decade. His memoir,
Actress of a Certain Age: My Twenty-Year Trail To Overnight Success, was released June10, 2025. On the first printing of the book, the spine was misspelled, missing an "R" in the word
Certain; Hiller joked about it on
The Daily Show with
Desi Lydic. In the 2025 revival of
Urinetown, Hiller played the role of Mr.McQueen. In June 2025, Hiller served as a panelist on NPR's ''
Wait Wait... Don't Tell Me! and was interviewed by Terry Gross on Fresh Air'' in August 2025. ==Personal life==