Mgbe agha biri, ọ ghọrọ onye otu na Fermi's Institute for Nuclear Studies. O mechara rụọ ọrụ na Institute for Advanced Study na Princeton, New Jersey, na Brookhaven National Laboratory, na Mahadum New York, ebe ọ ghọrọ prọfesọ na 1962. Nnyocha ya gụnyere physics dị elu, astrophysics na cosmology. N'afọ 1966 ọ gbara alụkwaghịm Marshall ma lụọ onye nrite Nobel Willard Libby. Ọ ghọrọ prọfesọ na Mahadum Colorado, na onye ọrụ na RAND Corporation. N'oge ndụ ya, ọ malitere inwe mmasị na nsogbu gburugburu ebe obibi na gburugburu ebe obibi, wee chepụta usoro iji isotope ratios na mgbanaka osisi iji mụọ mgbanwe ihu igwe. Ọ bụ onye na-akwado ike nke irradiation nri dị ka ụzọ nke igbu nje bacteria. Ajụjụ: Onye ka ọ na-alụbeghị mgbe 1966 gasịrị?
Marshall