Boyle is a Jesuit priest who has worked with gangs in East Los Angeles since 1986. He was originally supposed to work with the Dolores Mission there for a six-year term, but when the time came to leave, the community revolted, and he was allowed to stay. He's received national acclaim for his work helping the people he works with to find jobs and quality schooling.
Rubin worked with Johnny Cash for the last 10 years of Cash's life, collaborating on four critically acclaimed and Grammy award-winning albums (American Recordings, Unchained, American III: Solitary Man and American IV: The Man Comes Around.) At the time of Cash's death, they were collaborating on a box set that collects many unreleased tracks from those previous sessions, as well as a best-of CD. The five-CD collection is called Unearthed.