Rebel preacher and activist, Reverend Will Campbell, has died at the age of 88. Campbell was one of a small number of white clergymen who became deeply involved in the civil rights movement beginning in the 1950s. He took part in some of the struggle’s key moments, attending the founding of the Southern Christian Leadership Conference in 1957 and helping escort nine black students to integrate a high school in Little Rock, Arkansas, months later. Former U.S. President Jimmy Carter said: “Brother Will, as he was called by so many of us who knew him, made his own indelible mark as a minister and social activist in service to marginalized people of every race, creed and calling.”