Alvin M. Weinberg has played a key role in scientific developments of the 20th century. In 1941 he joined the University of Chicago group that developed the first chain reactor. As a member of this team, he worked on the reactor that produced the plutonium that would ultimately be used for the bomb dropped on Nagasaki, Japan. He served as director of ORAU's Institute for Energy Analysis (IEA), which pioneered investigations of the greenhouse effect,...