When aging genius Orson Welles and actor Sir Laurence Olivier meet in Ireland after many years, each brings his own “baggage” and sparks fly. Add to them the characters of theater critic Kenneth Tynan; Vivien Leigh, Olivier’s almost ex-wife; Joan Plowright, Olivier’s new woman; and an audacious Irishman, and play production bedlam prevails. With Orson’s Shadow, playwright and director Austin Pendleton, together with his codirector David Schweizer, has created a masterpiece that qualifies as much as comedy as it does drama.