There are two email lists for prison librarians which might help interested library workers to learn more about that kind of work.
ALA Prison List
For information covering prison librarianship, you can subscribe to the PRISON-L electronic discussion list.
Send the following message to firstname.lastname@example.org
subscribe PRISON-L YourFirstName YourLastName
Prison and Jail Librarians Interest Group (PRISON-LIB)
A discussion forum for librarians serving prisons/correctional institutions and jails. Teachers and program managers welcome, also. Visit http://lists.topica.com/lists/PRISON-LIB
or send a blank email to