John Gallagher Jr. has appeared in several television programs, including The West Wing (1999), Law & Order: Special Victims Unit (1999), NYPD Blue (1993), Ed (2000), Love Monkey (2006), and Hallmark Hall of Fame's film The Flamingo Rising (2001). He played Jim Harper in Aaron Sorkin's The Newsroom (2012) which aired on HBO[16]. He also appeared in HBO's mini-series Olive Kitteridge (2014), based on the Pulitzer-winning novel of the same name, in the role of Christopher Kitteridge.

Film credits include Pieces of April (2003), Woody Allen's Whatever Works (2009), Jonah Hex (2010), The Heart Machine (2014), Kenneth Lonergan's Margaret (2011), and a lead role in Short Term 12 (2013) opposite Brie Larson. In 2016, he starred in the thriller film 10 Cloverfield Lane (2016) and the horror thriller film Hush (2005).

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Trivia

e played guitar for a band named "Annie's Autograph".
Parents, June and John Gallagher, are musicians. Has played in several bands and performs occasionally as a singer/songwriter.
John originated the role of Jeff in David Lindsay Abaire's hit play "Kimberly Akimbo"
Played in a band called Old Springs Pike which plays relatively frequent gigs at various locations primarily in New York City.
Won a Tony Award in 2007 for his portrayal of Moritz in "Spring Awakening".
Younger brother of actress Jaime Gallagher.
Brought the role of Johnny/Jesus of Suburbia to Broadway as American Idiot begins previews March 2010 and opens on April 20, 2010 [March 2010]
In London rehearsing for the West End premiere of David Lindsay Abaire's hit play "Fuddy Meers". [March 2004]
Currently playing the role of Lee in the critically acclaimed Jez Butterworth play "Jerusalem" at the Music Box Theatre in New York City. This production is a 16 week limited engagement and opened on April 21, 2011 after starting previews on April 2nd. [April 2011]
Performing in "Farragut North" at Atlantic Theatre Company in Chelsea, New York. [November 2008]
Left the role of Johnny/Jesus of Suburbia in Green Day's American Idiot on February 27, 2011 to pursue a new role in the acclaimed play Jerusalem. [February 2011]
Now performing as Johnny in Green Day's "American Idiot" at the Berkeley Repertory Theatre, Berkeley, California. [September 2009]
Performing as Moritz in Spring Awakening on Broadway. [December 2006]

I don't have a pet but I dream of someday getting a pug dog whom I will name Croque Monsieur so that I may alternate between calling him Croque, Monsieur or his full name: Croque Monsieur. I'll more than likely only use his first and last name most often when he's been bad.