For New Phoenix Theatre-LA: John “Jack” Worthing in The Importance of Being Earnest; Konstantine in The Seagull; Eric Birling in An Inspector Calls; Simon Bliss in Hay Fever; Mortimer in Mary Stuart; Leo Hubbard in The Little Foxes; Roland Maule in Present Laughter; Rodrigo in The Cid; Oswald Alving in Ghosts; Hippolytus in Phaedre, Mercutio in Romeo and Juliet; Fabian in Twelfth Night; and the title role in Hamlet.

He is a member of the Beverly Hills Playhouse Ensemble. Other LA theatre work includes A Night Out at The Space and in a reading of Dante’s Inferno. Film work includes the independent film “Story of Your Life.”

Sean received his BFA in Theatre from SUNY Purchase, where he appeared as Leontes in A Winter’s Tale, Rev. Shannon in The Night of the Iguana, Old Pat in The Hostage and in the ensemble for Boy’s Life. Sean made his professional stage debut at age 8 when Bill Irwin plucked him from the audience at the Doolittle Theatre, dressed him in a gown and a funny hat, gave him a sledgehammer, and cast him as his beleaguered assistant in a commedia dell arte skit in Fool Moon.

Sean and his three O’Neill siblings comprise the comedy troupe behind the YouTube series “Brother-Sister-Sister-Brother.”