 In 1958 , Weinberg coauthored the first nuclear reactor textbook , The Physical Theory of Neutron Chain Reactors , with Wigner . The following year , 1959 , he was elected president of the American Nuclear Society and , in 1960 , began service on the President 's Science Advisory Committee under the Eisenhower and Kennedy administrations . Starting in 1945 with Patent # 2 @,@ 736 @,@ 696 , Weinberg , usually with Wigner , filed numerous patents on the light water reactor ( LWR ) technology that has provided the United States ' primary nuclear reactors . The main LWR types are Pressurized Water Reactors ( PWRs ) and Boiling Water Reactors ( BWRs ) , that serve in Naval propulsion and commercial nuclear power . In 1965 he was appointed vice president of Union Carbide 's Nuclear Division . 
