 A former chair of the "Bulletin of the Atomic Scientists" Board of Directors (1984–1998), the "Bulletin's" Leonard M. Rieser Award for Young Authors bears his name.Starting in 1985, he was the keeper of the Bulletin's symbolic Doomsday Clock and moved its minute hand to indicate how close or far away we were from the threat of nuclear annihilation.He died in the Dartmouth-Hitchcock Medical Center in New Hampshire at the age of 76.