SERVING MORE CHILDREN, CHANGING MORE LIVES Since 1955, Big Brothers Big Sisters of Greater Los Angeles has been a leader in providing children facing adversity with strong and enduring, professionally supported, one-to-one mentoring relationships with carefully screened adult volunteer mentors that change their lives for the better, forever. Children in our programs improve in school, avoid risky and delinquent behaviors, and achieve higher self-esteem and aspirations. Philanthropedia, a GuideStar company, recently named Big Brothers Big Sisters as the #1 high impact national nonprofit organization serving at-promise youth. Start reconnecting. Calling all Alumni! If you’re looking to give back to Big Brothers Big Sisters, but aren’t sure how, joining our alumni network and reconnecting with our organization is a great place to start. Please click on our services tab to connect and join our Alumni Association.