According to the information on their site, while in prison, there is not much mentoring of prisoners to help prepare them for successful reentry. They are located in Washington DC and seek volunteers.
Their latest post highlighted the book by someone incarcerated for 38 years.
See their post:
"Huck's Picks is written by Charles "Huck" Huckelberry who spent 38 years in prison before his recent release. He used his time on the inside very productively, honing his writing skills and accumulating numerous awards and honors. If you've seen our annual prisoner dramatizations at the Kennedy Center, you're familiar with some of his work". Check out the Safe Street Art Website. Safe Street Art