Froman remained at Los Alamos after the war, replacing Bacher as head of G Division (now renamed M Division) in 1945. In 1948, he was the scientific director of the
Operation Sandstone nuclear tests at
Enewetak Atoll in the Pacific. He was assistant director for weapons development from 1949 to 1951. He served as the associate technical director, later renamed deputy director, from 1951 until he retired in 1962. As such he was second only to the director of the Los Alamos National Laboratory,
Norris E. Bradbury, and he worked closely with Bradbury,
Edward Teller and
Stanislaw Ulam on the design of the
hydrogen bomb. He was also heavily involved with
Project Rover, the project to develop a
nuclear thermal rocket. Froman was married with two daughters, Kay and Eva. He died in Santa Fe, New Mexico on September 11, 1997. In 2009, Danny B. Stillman, a former head of intelligence at the Los Alamos National Laboratory, and
Thomas C. Reed, a weapons designer at the
Lawrence Livermore National Laboratory and a
Secretary of the Air Force, published a book titled
The Nuclear Express, in which they presented unsubstantiated allegations that an unnamed American scientist, easily identified as Froman, was a
KGB spy who gave the
Teller-Ulam design to the
Soviet Union. "The allegation that Froman was a spy", noted Robert Norris, "is likely to come as surprise to his colleagues and to many others". == Notes ==