Besides acting in 50 films, 25 plays on and off-Broadway and in four TV series, Shea, whose history with the island stage reaches back to the 1960s and the former Straight Wharf Theater, has directed and filmed movies and written screenplays. A founding member of the Nantucket Film Festival, Shea was just 26 when he made his Broadway debut in “Yentl,” for which he won the Theatre World Award for Most Promising Actor. He achieved international fame in 1982, at the age of 32, for his role as a young American idealist involved in Chilean political violence in the Academy Award-winning movie “Missing,” which also won the Cannes Film Festival Palme d’Or.