Epstein started working in September 1974 as a physics and mathematics teacher for teens at the Dalton School on the Upper East Side of Manhattan. Donald Barr, who served as the headmaster until June 1974, was known to have made several unconventional recruitments at the time, although it is unclear whether he had a direct role in hiring Epstein. Three months after Barr's departure, Epstein began to teach at the exclusive private school despite his lack of credentials. Epstein allegedly showed inappropriate behavior toward underage students at the time. He became acquainted with Alan Greenberg, the chief executive officer of Bear Stearns, whose son and daughter were going to the school. Greenberg's daughter, Lynne Koeppel, pointed to a parent-teacher conference where Epstein influenced another Dalton parent into advocating for him to Greenberg. In June 1976, Epstein was dismissed from Dalton for "poor performance". Greenberg offered him a job at Bear Stearns.