Kevin L. Sussman (born December 4, 1970) is an American actor and comedian. He played Walter on the ABC comedy-drama Ugly Betty and Stuart Bloom on the CBS sitcom The Big Bang Theory. Starting with the sixth season of The Big Bang Theory, he was promoted to a series regular. Sussman stars in the series Stuart Fails to Save the Universe, which debuted in July 2026.
Early life, family and education Sussman is the youngest of four brothers born to Jewish parents Michael and Barbara Sussman. He grew up in Staten Island, New York City, New York where he attended Staten Island Technical High School and graduated from New Dorp High School.
He attended the College of Staten Island for a year but graduated from the American Academy of Dramatic Arts in Manhattan, New York City. He later studied with acting teacher Uta Hagen for four years.
Career Sussman's professional acting began in commercials, playing geeks or nerds. At the time, he worked as a computer consultant.
In 1999, he made his film debut in Liberty Heights as Alan Joseph Zuckerman. Sussman moved to Los Angeles when he was cast in Ugly Betty. He played the character Stuart Bloom on The Big Bang Theory from 2009 to the series end in May 2019.
In 2011 and 2012, he worked with The Big Bang Theory co-star John Ross Bowie to create two television comedies: The Ever After Part (FOX) and The Second Coming of Rob (CBS).
On July 9, 2025, it was announced that Sussman would star in a spin-off series Stuart Fails to Save the Universe to be streamed on HBO Max. The show also stars Lauren Lapkus and Brian Posehn.
Personal life Sussman was married to Alessandra Young from 2006 until 2017.
Sussman married Addie Hall in April 2023.
Filmography
Film Year Title Role Notes 1999 Liberty Heights Alan Joseph Zuckerman 2000 Almost Famous Lenny 2001 Wet Hot American Summer Steve Kissing Jessica Stein Calculator Guy A.I. Artificial Intelligence Supernerd 2002 Pipe Dream James Threads Caesar Changing Lanes Tyler Cohen Sweet Home Alabama Barry Lowenstein 2004 Little Black Book Ira 2005 Hitch Neil 2006 The Wedding Album Oswald Funny Money Denis Slater Ira & Abby Lenny For Your Consideration Commercial Director 2007 Heavy Petting Ras 2008 Sincerely, Ted L. Nancy Ted Made of Honor Tiny Shorts Guy Insanitarium Dave Burn After Reading Tuchman Marsh Man 2009 Taking Woodstock Stan 2010 Killers Mac Bailey Alpha and Omega Shakey (voice) 2011 Freeloaders Benedict 'Benny' Vicvikis 2012 2nd Serve Scott Belcher/O.C.D. 2025 Hurricanna Bipolar Man
Television Year Title Role Notes 1996 Law & Order Joe 1 episode 1998 Ghost Stories Joey Howell 1 episode 1999 Third Watch Tuba Guy 1 episode 2000 The Sopranos Kevin Episode: "Guy Walks into a Psychiatrist's Office..." 2003 Law & Order: Criminal Intent Phil Hobart 1 episode 2004 ER Colin Episodes: "Just a Touch", "Abby Normal" 2006–2007 Ugly Betty Walter Main role (season 1) 2007–2008 My Name Is Earl Dwayne Episodes: "My Name Is Inmate #28301-016: Part 1", "No Heads and a Duffle Bag" 2008 CSI: Crime Scene Investigation Don 1 episode The Middleman Ivan Avi/The Palindrome 2009–2019 The Big Bang Theory Stuart Bloom Season 2–5; 7 (recurring)Season 6; 8–12 (series regular); 108 episodes 2010 The Mentalist Phil Redmond Episode: "Rose-Colored Glasses" The Good Guys Skeeter Episodes: "Bait & Switch", "$3.52" Childrens Hospital Daffy Giraffy 1 episode 2012 Weeds Terry Episodes: "Allosaurus Crush Castle", "Five Miles From Yetzer Hara", "Threshold" 2015 Wet Hot American Summer: First Day of Camp Steve 3 episodes 2022 The Dropout Mark Roessler 6 episodesCall Me KatZac2 episodes Better Call Saul Mr. Lingk 2023 Lessons in Chemistry Walter Pine Recurring 2025 FBI Agent Kevin Saxton 1 episode 2026- present Stuart Fails to Save the Universe Stuart Bloom Main role
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