(written from a Production point of view)
He is perhaps best known for his recurring role as Jewish Trekkie Noel Shempsky on the hit television series Frasier, starring Kelsey Grammer in the title role. Kerr appeared in 22 episodes of the series from the 13th episode in 1994 to the series finale in 2004. Noel, who worked at Frasier's radio station, was obsessed with Star Trek, including:
- being fluent in Klingon and, as a prank on Frasier, teaching him his son's Bar Mitzvah blessing in Klingon instead of Hebrew;
- having an autographed picture of Captain Kirk in his cubicle;
- circulating a petition to have a four-breasted "space vixen" added as a character on the show, as a tribute to his crush, Roz Doyle;
- having William Shatner issue a restraining order against him, due to an unfortunate incident with a fake phaser;
- asking Frasier to stop by a Star Trek convention and get Scott Bakula's autograph in order to complete his collection of Captain's autographs (Noel couldn't go himself because of the aforementioned restraining order); when Frasier failed to complete this task, he made up for it by purchasing the wig Joan Collins wore in "The City on the Edge of Forever (episode)" at auction and giving it to Noel.
Kerr and fellow Voyager guest actor Don McManus were regular on the series Oh Baby from 1998 through 2000. In addition, Kerr has made guest appearances on such programs as Law & Order (in an episode with Leon Russom), The Drew Carey Show (starring Diedrich Bader), Friends, Seinfeld (with Jason Alexander and Richard Herd), Veronica's Closet (starring Kirstie Alley, in an episode with Christopher McDonald), 3rd Rock from the Sun, Curb Your Enthusiasm, Will & Grace, ER (with season three Enterprise guest actors Steven Culp and Daniel Dae Kim), and CSI (with Rick Worthy). He has also been seen in such films as Jeffrey (1995, starring Patrick Stewart and Steven Weber), Stuart Saves His Family (1995, co-starring Robert Curtis-Brown, Aaron Lustig, Dakin Matthews, Denver Mattson, Richard Riehle, Jeremy Roberts, Camille Saviola, and Harris Yulin), Ed (with Bill Cobbs, Stan Ivar, and Leonard Kelly-Young), and Domino (2005, with Stanley Kamel) as well as the made-for-TV movies Alien Nation: The Enemy Within (1996, starring Gary Graham, Eric Pierpoint, Michele Scarabelli, and Tiny Ron), Toothless (1997, starring Kirstie Alley), The David Cassidy Story (2000, starring Andrew Kavovit, Malcolm McDowell, and Dey Young), and When Billie Beat Bobby (2001, with Bob Gunton).