Cambridge Rindge and Latin School
American Academy of Dramatic Arts
Joined the cast of the HBO series "Vinyl."
Appeared in the Woody Allen film "Blue Jasmine."
Appeared in the Coen Brothers movie "Inside Llewyn Davis"
Joined the cast of "Boardwalk Empire" as Leo D'Alessio.
Played Ed Small in the period drama "Revolutionary Road."
Joined the cast of the HBO drama "The Sopranos," playing Benny Fazio
Voiced the lemur sidekick Zini in Disney's "Dinosaur"
Cast as Marcellus in the Broadway revival of "The Music Man"
Had featured role in "Analyze This"
Co-starred as Steve Zahn's buddy in the comedy "Freak Talks About Sex"
Broadway debut, co-starring as Timon in the Broadway musical version of "The Lion King"
Co-starred in the screen comedy "Sgt. Bilko"
Portrayed Paul Marco in the biopic "Ed Wood"
Film debut, played Racetrack in the feature musical "Newsies"
Essayed the role of Vinnie Delpino on ABC comedy-drama, "Doogie Howser, M.D."
Moved to New York with his mother after graduating high school; began taking acting lessons
First professional role in a Boston production of "Cyrano de Bergerac"
Began acting in amateur theatricals in the Boston area after success in sixth grade production of "Pippin" (date approximate)
Raised in Cambridge, Massachusetts
Apprenticed at Theater 22, an off-off-Broadway theater
Played small roles on such TV series as "Kate and Allie" and "The Equalizer"
Was encouraged by his school drama teacher to begin acting professionally in plays around the Boston and Cambridge area while he was still in high school.
Worked day jobs as a telemarketer and at the New York Public Library to support himself before his acting career took off.
Played real life actor Paul Marco in the movie "Ed Wood," who eventually came onto the set to perform a cameo in the film. When the real Marco saw his name on the door to Casella's dressing room, he threw the actor's belongings out and claimed the room as his own.