Leigh Raiford is an associate professor of African-American studies at the University of California, Berkeley. She is the author of Imprisoned in a Luminous Glare: Photography and the African-American Freedom Struggle.
For 20 years, Robert Shelton punched the clock at Brooklyn's cavernous sugar refinery. Now he's a docent at Kara Walker's art exhibit there, sharing with visitors the story of his life.