Who We Are Excellence Community Schools (ECS) is a Charter Management Organization (CMO) supporting schools in the Bronx, NY and Stamford, CT. Our programs are based on a proven, nationally recognized model, which originated in our flagship school, the Bronx Charter School for Excellence, a National Blue Ribbon School. Our Mission and Vision Our schools prepare young scholars to compete for admission to and succeed in top public, private, and parochial high schools by cultivating their intellec…