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John Howard Gallagher Jr. (born June 17, 1984) is an American actor and musician known for originating the role of Moritz Stiefel in Duncan Sheik and Steven Sater's rock musical Spring Awakening, which earned him a Tony Award for Best Featured Actor in a Musical. He also played Johnny in Green Day's Broadway musical, American Idiot, Lee in the 2011 Broadway production of Jerusalem, and Edmund in the 2016 Broadway revival of Long Day's Journey Into Night. He portrayed Jim Harper in Aaron Sorkin's drama series The Newsroom, starred in the HBO mini-series Olive Kitteridge, and played Emmett DeWitt in 10 Cloverfield Lane.

Untitled The Exorcist Film

I.S.S.
as Christian Campbell

Which Brings Me to You
as Wallace

The Same Storm
as Dale Salt

Gone in the Night
as Max

Abandoned
as Alex

Spring Awakening: Those You've Known
as Self - Moritz

Art That Made Us
as Self - Associate Prof. of Early Modern History

Come Play
as Marty

Love Life
as Luke Ducharme

Stars in the House
as Self

Underwater
as Liam Smith

Modern Love
as Rob

American Woman
as Juan

The Best of Enemies
as Lee Trombley

Sadie
as Cyrus

Peppermint
as Detective Stan Carmichael

The Miseducation of Cameron Post
as Reverend Rick

The Belko Experiment
as Mike Milch

Westworld
as Liam Dempsey

Easy
as Lucas

Hush
as The Man

10 Cloverfield Lane
as Emmett

Olive Kitteridge
as Christopher Kitteridge

The Heart Machine
as Cody
Short Term 12: Behind the Scenes
as Self

Broadway Idiot
as Self (archive footage)

Short Term 12
as Mason

The Newsroom
as James Harper

Margaret
as Darren

Jonah Hex
as Second Lt. Evan

Whatever Works
as Perry

Love Monkey
as Paul

The Good Student
as Brett Mullen

Pieces of April
as Timmy Burns

Law & Order: Criminal Intent
as Gary

The Flamingo Rising
as Gary

Ed
as Eric

The West Wing
as Tyler

Law & Order: Special Victims Unit
as Jeff Lynwood

Law & Order
as Terrence Holt

Hallmark Hall of Fame
as Gary

Eleven Days
Swim Fishy
as Abel
20/20