The mission of the Youth Leadership Institute (YLI) is to build communities where youth and their adult allies come together to create positive social change. This year marks the 25th anniversary of Youth Leadership Institute. YLI has worked with over 89,000 young people ages 12 to 26 in 220 communities nationally and internationally. Established in 1991 in Marin County, YLI now operates youth leadership and development programs in Fresno, Marin, San Francisco, and San Mateo counties, with a focus on implementing leadership development, research, and campaigns to improve the health of communities. A nationally recognized leader in the field of youth development, YLI provides young people with the tools and support to identify community needs and implement solutions while also training adult allies to successfully partner with youth in community change efforts.