John Thomas Gegenhuber is an American actor and voice actor. Since 2013, he has been the voice of Cap'n Crunch. Raised in Palatine, Illinois, his earliest screen-acting credit was in the 1986 PBS telefilm Under the Biltmore Clock. He has starred in several series, as well as appeared as a guest or recurring character on numerous shows, including Seinfeld (1993), Murphy Brown (1994), Star Trek: Voyager (1995-1996), Mad About You (1997), Law & Order (1997) and Seven Days (1999). He was part of the cast of the NBC series Earth 2 (1994-1995). He also appeared in the movies Straight Talk (1992) and Rookie of the Year (1993), and video games like Lego Dimensions (2015).
In 2006, Gegenhuber co-wrote, co-directed and co-starred in The Perverts which was shown at the 2006 ITVFest (Independent Television Festival).
A longtime teacher of the improvisation techniques of Viola Spolin, he conducts classes as an acting instructor. He became Education Coordinator for The Open Fist Theatre Company in Los Angeles, California in 2007.
Gegenhuber received his BFA in Acting from the Goodman School of Drama in Chicago (now The Theatre School at DePaul University).
Contents
Film and television appearances
The Patrick Star Show (2021–present) as Old Man Jenkins
Kamp Koral: SpongeBob's Under Years (2021-2024) as Jimmy Blobfish
SpongeBob SquarePants (2018–present) as Old Man Jenkins, Walter Haddock, Barry, Impound Yard Worker, additional voices
The Perverts (2006) as Bob
A Question of Loyalty (2005) as SS Man (uncredited)
The Making of Daniel Boone (2003) as Benjamin Logan
Seven Days (1999) (credited as John Wollner) as Lloyd Sype in "Pinball Wizard"
L.A. Doctors (1999) as Dr. Doug Carter in "Where the Rubber Meets the Road" and "True Believers"
The Pretender (1997) as Dr. Lawford in "Nip and Tuck"
Mad About You (1997) as Dr. Ben in "The Birth"
Law & Order (1997) as Pilot in "Judgement in LA: Turnaround"
Star Trek: Voyager (1995-1996) as Tierna in "Basics, Part 1" and Kelat in "Alliances" and "Maneuvers"
Earth 2 (1994-1995) as Morgan Martin
Murphy Brown (1994) as Sean Van Ohlen in "The Deal of the Art"
Grace Under Fire (1993) as Blind Mouse in "The Good, the Bad, and the Pharmacist"
Seinfeld (1993) Resident Doctor in "The Bris"
Rookie of the Year (1993) as Derkin
Straight Talk (1992) as Waiter
Under the Biltmore Clock (1986) as Chauffeur
Theatre appearances
Open Fist Theatre: The Room (Kermit Roosevelt)
Actor's Gang: Ugly's First World (Aleister Crowley)
Goodman Theater: Puddin 'N Pete (Sal, Janskey)
Goodman Theater: The Visit (Painter)
Steppenwolf Theater: Harvey (Wilson)
Coast Playhouse: Help! (Garwood)
Arena Stage: Crime and Punishment (Lebeziantnikov)
Arena Stage: The Wild Duck (Molvig)
Arena Stage: Women and Water (Amos Mason)
Arena Stage: Good Person of Setzuan (Wang)
Arena Stage: Taming of the Shrew (Biondello)
Northlight Theater: The White Plague (Dr. Galen)
Northlight Theater: Teibele and her Demon (Beadle)
Northlight Theater: Heart of a Dog The Adding Machine (u/s Frank Galati Hystopolis Puppet Thtr Mr. Zero)
Stormfield Theater: The Sons of Corl Gap (Henry)
Library Theater: Caligula (Scipio)
Library Theater: Edward II (Gaveston)
Video game appearances
Lego Dimensions (2015) as voice of Cragger from Lego Legends of Chima
Dishonored 2 (2016) as voice of Kirin Jindosh
SpongeBob SquarePants: The Cosmic Shake (2023) as voices of Old Man Jenkins, Arcade Machine, Citizens
SpongeBob SquarePants: Titans of the Tide (2025) as voices of Old Man Jenkins, Guard, Citizens
