This study examined the development of a mentor identity among college and university registrars. In addition to participant-created timeline documents and resumes, two semi-structured interviews were conducted with seven college or university registrars from various types of institutions in the United States. The transcripts were analyzed and a narrative for each participant was created. Three themes and nine subthemes emerged from the narratives: mentoring enactment (offering mentoring, friendship, vulnerability, and challenging assignments), self-perception as mentor (initial uncertainty and age and experience), and evolution of mentor motivation (mirroring, responsibility, and gratification). Four conclusions emerged from these themes: (a) college and university registrars met the seminal definition of mentoring, as they portrayed both psychosocial and career development support; (b) vulnerability as a mentoring behavior was more likely to be enacted by women; (c) after a period of initial uncertainty, mentors felt more confident in their role with age and experience; and (d) there were similarities between the mentors and their mentees. These conclusions were considered in light of the extant literature and Ibarra's provisional selves theory. The findings suggest the need for a framework for self-assessment, reflection, and action; guidance for the registrar profession; and the expansion of organizational efforts to develop mentoring capabilities among their leaders and within their cultures. Further research should encompass (a) both members of the mentoring dyad, (b) contexts other than the registrar profession, (c) other developmental relationship types, (d) mentors and proteges from marginalized identities, and (e) virtual mentoring practices. [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.]