Peer facilitation during interprofessional simulation-based learning enables students from diverse professions and backgrounds to enrich each other's learning in small groups. Peer facilitators are interprofessional role models and serve to maintain neutrality, listen actively, and respond to group dynamics supporting interprofessional education (IPE). This paper will report the outcomes of an interprofessional peer facilitation program as part of a larger IPE curriculum in a graduate program in the health professions. The authors conducted a mixed methods evaluation of peer facilitators' development measured through a peer facilitator knowledge and self-efficacy tool. Results of qualitative and quantitative data from four years of the program are discussed, documenting the outcomes serving as a peer facilitator has on entry-level health professions learners.