Fiedler was born in Newark, New Jersey, to Jewish parents Lillian and Jacob Fiedler. "Eliezar Aaron" was his original Hebrew name. In his early years, Fiedler developed a strong connection to his grandparents, Leon (originally Leib) and Perl Rosenstrauch. As Mark Royden Winchell writes in his 2002 book on Fiedler, "during Leslie's childhood, Leon and Perl Rosenstrauch were more like parents to Leslie than were his own father and mother" (Winchell 5).
At an early age, Fiedler's family moved from Newark to East Orange, New Jersey, a town that lacked a substantial Jewish community. Fiedler was forced to contend with anti-semitism from his fellow students who were Protestants and Catholics. The move to East Orange was short-lived and the family soon returned to Newark where Fiedler continued his education in public schools. Fiedler developed a resentment toward his teachers, who forced him to use standard English pronunciations instead of his ethnic dialect. While attending school, Fiedler also worked in his uncle's shoe store where his encounters with coworkers served as inspiration for some of the characters he created in his later work. At South Side High School, Fiedler began to express interest in socialism, which eventually led to him nearly getting arrested after a loud political rant on a soapbox on Newark's Bergen Street.
At an early age, Fiedler's family moved from Newark to East Orange, New Jersey, a town that lacked a substantial Jewish community. Fiedler was forced to contend with anti-semitism from his fellow students who were Protestants and Catholics. The move to East Orange was short-lived and the family soon returned to Newark where Fiedler continued his education in public schools. Fiedler developed a resentment toward his teachers, who forced him to use standard English pronunciations instead of his ethnic dialect. While attending school, Fiedler also worked in his uncle's shoe store where his encounters with coworkers served as inspiration for some of the characters he created in his later work. At South Side High School, Fiedler began to express interest in socialism, which eventually led to him nearly getting arrested after a loud political rant on a soapbox on Newark's Bergen Street.