- Nuclear physicist from MIT who turned against the atomic bomb.

- President, Council for a Livable World (explicit reason for inclusion on the Enemies List) and the Albert Einstein Peace Foundation.

- Listed both in the Top 20 and under "Organizations" along with Council for a Livable World, an arms control advocacy group that campaigned hard against Nixon.

- as a young graduate student, worked with Enrico Fermi and Leo Szilard to create the first controlled nuclear chain reaction on Dec. 2, 1942. As part of the Manhattan Project, worked at Oak Ridge, Tennessee and Los Alamos, NM to develop the first plutonium bomb in 1943.

- Famously said (in 1981 and maybe multiple times), "Having been involved in the original sin, I've spent the rest of my life trying to atone for it."

- Also, "Nuclear weapons aren't good for anything."

- In 1946, lobbied against military control of nuclear research and for peaceful uses of atomic energy.

- Vice President of the Federation of American Scientists, one of the first groups dedicated to controlling nuclear weapons.

- worked with scientists in the Soviet Union to rally support for arms agreements.

- Editor (1975) of the Bulletin of Atomic Scientists, which is noted for the "doomsday clock," introduced in 1959, showing an estimate of how close the world is to nuclear war.

- Secretary-general of the "Pugwash" Conferences on Science and World affairs, an organization that won the Nobel Peace Prize in 1995.

- prolific writer of essays and articles criticizing governments for doing too little to reduce nuclear stockpiles.

- His essays on the peace movement are collected in the 1979 book, "A Voice Crying in the Wilderness."

- His NY Times obituary does not mention the Enemies List, but the MIT News obituary notes, "He was especially proud, according to colleagues, to be on President Richard Nixon's 'enemies list.'"

- not to be confused with Bernard Feld, Alabama-based author of Blood Relations and Scantytown or with the late Bernard H. Feld, founder of Illinois-based Feldco Windows and Doors.