Daniel Joseph Berrigan, SJ, was a Jesuit priest, anti-war activist, Christian pacifist, and author. He wrote more than fifty books about the Bible, spirituality, and resistance to war. Berrigan is most known for being vocal about pacifism; for his protests, including his association with the Catonsville Nine; and for cofounding the Catholic Peace Fellowship and the interfaith group Clergy and Laity Concerned about Vietnam, whose leaders included Martin Luther King Jr., Richard John Neuhaus, and Abraham Joshua Heschel.