While at La MaMa, Power starred in a number of productions, most notably the original and remount of "Jews And Jesus" by Oren Safdie. Also under Ellen Stewart he wrote and directed "Lady/Speak/Easy", set in Harlem, and based on the life and music of Billie Holiday. The cast included musicians Bemshi Shearer (as Lady Day), bass player Theo Wilson (son of Billie's piano player Teddy Wilson), Jeremy Pelt on Trumpet, Ed Swanston (ex- piano for Louis Armstrong), Kalil Madi (ex-drummer for Billie Holiday) and Michael 'Smallchange' Johnson(Lemon Bucket), who was also musical director. During this time in New York, Power played the title role in the Irish Repertory Theatre’s production of The Shadow of A Gunman, and starred in The Irish Arts production’s "Celtic Tiger Me Arse" directed by Neal Jones, "Rinty and Paddywack"; and played "Murph" in the Second Stage production of The Indian Wants the Bronx, and "Prince Hal" in the Gorilla Repertory Theatre Company’s production of Henry IV parts 1 and 2. Through his work with the Irish Repertory Theatre, Power was offered the role of Juror number 7 in the Irish premiere of 12 Angry Men by Lane Productions in Dublin, the play ran for 18 months. This was followed by the lead role in another Lane production of 44 Sycamore by Bernard Farrell, which ran for 12 months. Power's Irish production company Big Papa then co-produced Sam Shepard’s Fool For Love at The New Theatre.