Playbill.com is marking the special day with a collection of videos from his appearances in Spring Awakening, American Idiot and in concert.

John Gallagher, Jr. - "Fan Letter."

John Gallagher, Jr. - "Let Me Come Home."

Spring Awakening's performance at the 2007 Tony Awards:

"The Bitch of Living" music video:

John Gallagher Jr - "The Goodbye Song" - Joe Iconis Jamboree.

American Idiot Farewell to John Gallagher Jr., Michael Esper, and Billie Joe Armstrong.

"Wake Me Up When September Ends" acoustic.

"All That's Known."

The cast of Spring Awakening performs "Touch Me" on "The View":

"Constance."

Gallagher, Jr. with original cast member Lauren Pitchard singing "Blue Wind":

"Wake Me Up When September Ends" on "Regis & Kelly."

The cast of Spring Awakening performs a medley of songs from the musical on "Good Morning America":

"Still Sixteen."

American Idiot performs on "David Letterman."

Spring Awakening's performance on "The Late Show With David Letterman":

The cast performs "My Junk" at Broadway in Bryant Park:

John Gallagher, Jr. and Pritchard sing "Don't Do Sadness/Blue Wind" at Broadway in Bryant Park:

American Idiot cast performance at 2010 Tony Awards.

The cast sings "Totally F*cked" at the Virgin Megastore in Times Square:

Spring Awakening cast members perform "The Song of Purple Summer" at Joe's Pub: