
Born in 1926, the son of a furrier.
A Graduate of Harvard University he was a star physicist. Served in the United States Army during World War II. Had leftist beliefs early on, feeling that the Soviet philosophy was more idealogically align with his views. Met Saville "Savy" Sax while attending Harvard, the two sharing common socio-political beliefs.
Was assigned to work on the Manhattan Project in Los Alamos, New Mexico, helping to developed the atomic bomb. Believed that the United States unilateral control over Atomic bomb weaponry gave the country too much power that could lead to possible disaster if there was no other country with the proper tools to serve as a counter-balance. Decided to help to even the balance of power by providing information to the Soviet Union in order to aid them in their own Atomic research. Along with Sax, decided to make contact with Soviet officials to initiate an information transfer.
Sax made contact with Nicola Napoli, the president of Soviet cultural propaganda organization in New York City called Artkino. Sax told Napoli that he had a friend who was privy to top secret atomic research information and wanted to share it with the Soviet Union. Hall at the same time visited the Amtorg, an import/export company that served as a cover for the base of operations for a network of Soviet spies. There he spoke with a warehouse worker who directed him to meet with Sergei Kurnakov, a Soviet journalist based in New York. Napoli had also suggested that Sax meet with Kurnakov.