An Invitation to Apply for the Position of. Middle School Humanities Teacher - Multiple Locations (Available 2022-23) Bronx, NY. About Public Prep. Public Prep is an award-winning network of charter schools across Manhattan and the Bronx and the nation’s. first non-profit tuition-free charter school network that develops exceptional Pre-K, and single-gender elementary and middle public schools. We pursue continuous excellence through our dedicati...