David Greenglass (March 2, 1922 - July 1, 2014) was an American spy for the Soviet Union. He worked at the Los Alamos laboratory from August 1944 until February 1946. He was arrested by the FBI for espionage in June 1950 and implicated Julius Rosenberg. He denied his sister Ethel's involvement when he testified before a grand jury. In 1951, weeks before the trial, he changed his testimony to claim that Ethel had typed up his notes. He testified against his sister and her husband in court as part of an immunity agreement and served nine and a half years in prison. In 1996, he recanted his testimony in an interview with NY Times reporter Sam Roberts and stated he had lied under oath in order to protect his wife. "I frankly think my wife did the typing, but I don't remember." He explained, "My wife is more important to me than my sister. Or my mother or my father, O.K.? And she was the mother of my children."