LEF, the Lewisville ISD Education Foundation, supports excellence in education In Lewisville ISD, which serves Lewisville, Flower Mound, Carrollton, The Colony, Highland Village and more. The Foundation is a nonprofit 501(c)(3) organization that supports innovative and interactive teacher grants and scholarships for LISD's graduating seniors. In addition, LEF provides campus grants, awards of excellence, and supplemental funds for enrichment. Established in 1990, LEF, has reached nearly $4 million in total giving to Lewisville ISD thanks to an incredibly hard-working, active Board of Directors and a giving, charitable community of supporters.