There he visited the Institute for Advanced Study for a year or so, then taught at the University of Kansas and at the University of Colorado, before settling at Penn State in 1963, where he remained until his retirement in 1976.
There he visited the Institute for Advanced Study for a year or so, then taught at the University of Kansas and at the University of Colorado. This was before. There he visited the Institute for Advanced Study for a year or so, was settling at Penn State in 1963. He remained until his retirement in 1976.