uncle, was convicted of fraud. Bernie Marcus was imprisoned at Sing Sing, and the young Cohn frequently visited him there. After attending Horace Mann School and the Fieldston School and completing studies at Columbia College in 1946, Cohn graduated from Columbia Law School at the age of 20. Early career After his graduation from law school, Cohn worked as a clerk for the U.S. Attorney for the Southern District of New York for two years. In May 1948, at age 21, he was old enough to be admitted to the state bar. He became an assistant U.S. attorney later that month. In 1948, Cohn also became a board member of the American Jewish League Against Communism. As an Assistant US Attorney, Cohn helped to secure convictions in a number of well-publicized trials of accused Soviet operatives. One of the first began in December 1950 with the prosecution of William Remington, a former Commerce Department employee and member of the War Production Board who had been accused of espionage by KGB defector Elizabeth Bentley. Although an indictment for espionage could not be secured, Remington had denied his longtime membership in the Communist Party USA on two separate occasions and was convicted of perjury in two separate trials. While working in Saypol's office for the Southern District of New York, Cohn aided in the prosecution of 11 members of the American Communist Party for advocating for the violent overthrow of the US government, under the Smith Act. Rosenberg trial Cohn played a prominent role in the 1951 espionage trial of Julius and Ethel Rosenberg. Cohn's direct examination of Ethel's brother, David Greenglass, produced testimony that was central to the Rosenbergs' conviction and subsequent execution. Greenglass testified that he had assisted the espionage activities of his brother in law by acting as a courier of classified documents that had been stolen from the Manhattan Project by Klaus Fuchs. Greenglass would later change his story and allege that he committed perjury at the trial in order "to protect himself and his wife, Ruth, and that he was encouraged by the prosecution to do so." Cohn always took great pride in the Rosenberg verdict and claimed to have played an even greater part than his public role. He said in his autobiography that his own influence had led to both Chief Prosecutor Saypol and Judge Irving Kaufman being appointed to the case. Cohn further said