Jonathan Guryan, faculty co-director of the University of Chicago’s education lab, said the program began three years ago at Gage Park High School and has since expanded to Bogan, Daniel Hale Williams Preparatory School of Medicine, Bowen High School, Percy L. Julian High School and TEAM Englewood Community Academy High School. Urban Labs and CPS worked together to identify schools in neighborhoods with high rates of poverty and violence, and where school leadership was interested in having the program. Within each school, classrooms were randomly selected, Guryan said.