Gallagher starred in "American Idiot", a musical based on the Green Day album of the same name, along with fellow Spring Awakening alumni Brian Charles Johnson and Gerard Canonico. "American Idiot" premiered in Berkeley, California at the Berkeley Repertory Theater on September 4, 2009. The show's run ended on November 15, 2009. It began previews on Broadway at the St. James Theatre March 24, 2010 and officially opened on April 20, 2010. It was later nominated for three 2010 Tony Awards, of which it won two. Gallagher played Johnny, or "Jesus of Suburbia". Gallagher departed "American Idiot" on February 27, 2011 and was succeeded by Van Hughes The show's run ended on April 24, 2011.