Big Brothers Big Sisters of New York City annually serves more than 3,000 young people across the five boroughs matching youth between the ages of seven and seventeen with adult mentors. Expected outcomes include academic achievement, a positive mindset, and avoidance of risky behaviors. Philliber Research and Evaluation is tracking these outcomes in a sample of 500 program participants and a comparison group of 150 similar youth. In addition to working directly with youth, Big Brothers Big Sisters of New York City helps youth agencies strengthen their mentoring programs through technical assistance and professional development workshops. Philliber is documenting the impact of this assistance as well as outcomes for youth.