The author, Michael Christopher, was a career corrections officer in New York State who reached the rank of Lieutenant before his retirement after almost twenty-seven years of service. During the course of his duties, he had contact with tens of thousands of prisoners, including infamous inmates like David Berkowitz a.k.a. 'The Son of Sam' and Robert Chambers a.k.a. 'The Preppy Killer', but after more than three decades, the one that left him with a positive memory is Tupac Shakur. Tupac Behind Bars is Officer Christopher's account of his personal encounters with the famous rapper at the Clinton Correctional Facility.