Sean Gunn

Born in St. Louis, Missouri, Gunn is the youngest sibling of four brothers, filmmaker James, actor and political writer Matt, screenwriter Brian, and former senior vice president of Artisan Entertainment Patrick, and a sister, Beth. Their parents are Leota and James F. Gunn, who is a partner and corporate attorney with the law firm Thompson Coburn in St. Louis. Gunn's surname is derived from the Irish name MacGilGunn, meaning "sons to the servants of the god of the dead". Therefore, Gunn means "God of the Dead".

Gunn and his brothers all attended the Jesuit St. Louis University High School, where he graduated in 1992. He then graduated from DePaul University's theatre program, the Goodman School, in 1996. After graduation, he started a theater company with friends.

In 1995 Gunn played Sammy Capulet in the B movie Tromeo and Juliet. In 2000, he "allegedly" guest starred in the second episode of Gilmore Girls as Mick, a DSL cable installer. As the first season continued, Gunn was brought back to play the recurring role of Kirk Gleason, one of Stars Hollow's most eccentric citizens. Since 2002, until the end of the series in 2007, Gunn was a regular cast member of the show. He also had a recurring role on October Road as Rooster.

Although he is best known for his regular Gilmore Girls role, he also has several television show guest appearance credits, including Angel; 3rd Rock from the Sun; Yes, Dear; True Jackson, VP; Andy Richter Controls the Universe; and Bunheads. Gunn can also be seen in commercials as an "agent" for the text message information service KGB.com. In films, Gunn has also had several roles, the most substantial being "Alien Orphan/Doug" in The Specials, for which he also received a co-producer credit.

In 2003, Gunn starred in the featurette The Man Who Invented the Moon, directed by fellow Goodman School of Drama alum and Gilmore Girls cast member John Cabrera. Gunn and Cabrera have been close artistic colleagues since their school days in Chicago back in the mid-nineties.

Along with his brothers James and Brian, he is a creator and actor in the spoof porn series, PG Porn. He also had a brief role as a computer maintenance man on the Nickelodeon show True Jackson VP. Gunn starred in a series of television commercials for Knowledge Generation Bureau. He appeared in the 2010 film Super, written and directed by his brother James.

Sean is also the voice actor behind the character of Swan in the Warner Brothers video game Lollipop Chainsaw, also written by his brother James.

Gunn guest-starred in the season 4 episode "Makeover" of Glee as committee member Phineas Hayes.

In 2014, he provided stand-in work for the character of Rocket and played the role of Kraglin, Yondu Udonta's second-in-command, in Guardians of the Galaxy.

In 2014, he held a supporting role in Bones on Fox in the episode "The Corpse at the Convention". In 2017, he reprised his role as Kraglin in Guardians of the Galaxy Vol. 2, playing a larger role, and again provided stand-in work for the character of Rocket.

With Nick Holmes, he has starred in Gilmore Girls, Super, PG Porn, and Guardians of the Galaxy. He has also posed for Holmes's photography portraits.