Although many studies examine benefits to the mentees, this study examined the growth and development of the mentors in the context of a particular teacher induction program, the University of Missouri Teaching Fellowship Program. This program is unique in that mentors are released from classroom duties to mentor two fellows, conduct professional development in their schools and work with the university. First, second and third-year mentors were interviewed in focus groups. Results indicated that mentors believed their professional development included: relearning, seeing a bigger picture, expanding their roles, gaining insights about the process of mentoring and understanding the impact of the program on themselves. Data suggest that having various duties encourages these mentors to better understand the complexity of schooling, which increases their leadership potential and gives them more confidence. Also, mentoring is somewhat developmental; it must be learned by engaging in it and needs to be consistently supported. Implications for existing mentoring programs are discussed. (Contains 2 tables and 1 figure.)