アルゴンヌ国立研究所
In 1963 he was appointed senior scientist at the Argonne National Laboratory near Chicago, where he was later (1964-1970) director of the Division of Applied Mathematics. From 1968 to 1970 he was fourteenth president of the Society for Industrial and Applied Mathematics. In 1979 he retired as professor emeritus at Northwestern University. Argonne National Laboratory currently offers a named fellowship in his honor.