The purpose of this phenomenological study was to understand the socialization (Weidman, Twale, & Stein, 2001) experiences of part-time doctoral students as a result of peer mentorship in one college. Part-time doctoral students are identified as students who are maintaining full-time employment or obligations outside of the university. The research questions for this study include: How do part-time doctoral students experience socialization through peer mentorship? How do part-time doctoral students experience spontaneous peer mentorship? How do part-time doctoral students experience peer mentorship as a result of their involvement in formal socialization experiences? How can the experiences of these part-time doctoral students be used to create implications for practice in the socialization by peer mentorship? The 21 participants in this study were all enrolled in a large university at the time of the study. A composite description including themes of collegiality and isolation in the participants' experiences with peer mentorship was developed. Participants experienced collegiality through nurturing mentoring, educative mentoring, dyadic co-mentoring with peers, workplace colleagues and personal friends who provided efficacious experiences as they negotiated their scholarly identity. Isolation includes feelings of being second-tier doctoral students and life getting in the way combined with feelings of negative self-efficacy as they negotiated their scholarly identity. Interrelationships between the themes and subthemes are delineated. Implications for practice to encourage peer mentorship for part-time doctoral students were created. Suggestions are provided for both part-time doctoral students and their faculty in order to facilitate the process of socialization to the academy through peer mentorship. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]