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, and Lee in the 2011 Broadway production of Jerusalem. He played Jim Harper in Aaron Sorkin's The Newsroom and starred in the HBO mini-series Olive Kitteridge (2014).