The Later years
Leo, horrified by the use of the atomic bomb, switched fields to molecular biology in 1947. He was diagnosed with bladder cancer in 1960 and underwent a radiation treatment that he had developed. He had another round in 1962, and then the cancer remained in remission. The Council for a Livable World was formed in 1962 with his help, and the group tried to tell the people and Congress about the threat of nuclear war. They also advocated arms control and nuclear disarmament. Leo died in May 1964 from a heart attack.

Title Early Life Various Projects  The Idea of the Chain Reaction The Manhattan Project The Use of Atomic Weapons Bibliography