Upon his parole, he got cast last summer in the title role in the company’s “Othello” as part of its professional season. While many Bay Area theaters have social justice or education programs, most keep that work separate from what they produce on a main stage. Marin Shakespeare’s investment in this actor shows a remarkably deep commitment to the power of theater to change lives, especially the lives that society most tends to overlook. Robert Currier directs, transposing the show to the rural South, with original bluegrass music by Billie Cox.