Mediator Mentors, a collaborative research and service project, was begun by California State University-Fresno faculty and the staff of an elementary school (K–8) in the Central San Joaquin Valley. The purpose of the research was to assess conflict resolution program effects on students (N = 300) and school climate. Cross-age mentoring is an important component of this collaborative project. University students preparing for roles in helping professions served as mentors to elementary students. Impacts on student cognitive and affective perspective taking were assessed and student perceptions of school safety were explored.