Few social programs have attempted to provide high-risk adults -- and, particularly, former prisoners -- with mentors. And thus there are few resources that offer practical advice and recommendations for mentoring this population, given its distinct needs, assets and challenges. While much remains to be tested and learned, this manual draws on the experience of the 11 sites involved in P/PV'sReady4Work prisoner reentry demonstration, as well as established best practices in the mentoring field, to provide guidelines for practitioners who are interested in developing a mentoring program to support former prisoners and enhance the effectiveness of other reentry services, such as employment and case management services.The guide was originally published by the US Department of Labor in November 2007 under the title Mentoring Ex-Prisoners: A Guide for Prisoner Reentry Programs. However, because of growing interest in establishing mentoring programs as part of larger reentry efforts around the country, P/PV decided to reissue the guide, along with updated information related to P/PV's evaluation of Ready4Work (particularly findings published in Mentoring Formerly Incarcerated Adults, 2009.