The first years of teaching can be difficult for some teachers and substantial numbers of them leave the profession early in their careers. This attrition can be detrimental to student academic outcomes and financially damaging to school districts. One solution schools have implemented is peer mentoring teacher induction programs. The Peer Assistance and Review program (PAR) is one such mentoring initiative adopted by a group of schools in a large, urban school district in the Southwestern United States. Administrative data indicate that schools that implemented PAR saw decreases in new teachers leaving and teacher attrition overall.