Bit parts and commercials began trickling in by 2009. There were movie roles in "J. Edgar," ''Gayby," ''Lincoln" and "Inside Llewyn Davis;" TV parts in "Law & Order;" and Broadway gigs on stage in "Angels in America" and "Man and Boy."
And keeping with the once a Marine, always a Marine code of Marine loyalty, Driver started his own nonprofit organization. Arts in the Armed Forces is a group that continues to stage performances for military personnel.
Driver also found time to marry his girlfriend, actress Joanne Tucker, and settle into a home in the Brooklyn Heights section of New York.
But it wasn't until he landed the role of Adam Sackler in "Girls" in 2012 that Driver was able to completely remove himself from himself in the eyes of the masses. Driver worked his character so brilliantly, it got to a point where he couldn't go to a coffee shop in his neighborhood without getting hassled by some fan bitter over his character's treatment of Hannah, his "Girls" girlfriend played just as brilliantly by Lena Dunham.
Some, including Rolling Stone and Interview magazines, call the kid from Mishawaka one of TV's most unsuspecting sex symbols since "Seinfeld's" Kramer.
"Obviously, luck always plays a part in success of this magnitude," Chamberlin says. "That, and he's got an amazing agent."
Then there's that look -- a dark, pensive, dangerous handsomeness that appears bemused by stupidity around him yet disturbed by his own inner confusion. It's a look they don't teach at Juilliard.
"What's different about Adam is that he's got a natural knack for performing," Chamberlin says. "He's very intelligent. The fact is that he's not your normal, talented, good-looking drama student. He's different. A lot are stereotypical looking, and they're a dime a dozen. He's got a look about him that's different."