I muri i te pakanga, ka noho ia hei hoa i te Fermi's Institute for Nuclear Studies. I muri mai ka mahi ia i te Institute for Advanced Study i Princeton, New Jersey, te Brookhaven National Laboratory, me te Whare Wānanga o New York, i reira ia i noho ai hei kaiwhakaako i te tau 1962. I roto i tana rangahau i uru atu ki te ahupūngao kaha-nui, te ahupūngao me te ao. I te tau 1966 ka wehe ia i a Marshall ka marena ki te toa Nobel, a Willard Libby. I noho ia hei kaiwhakaako i te Whare Wānanga o Colorado, me te mema o te RAND Corporation. I muri mai i te oranga, ka hiahia ia ki nga take taiao me te taiao, a ka hangaia e ia he tikanga hei whakamahi i nga waahanga isotope i roto i nga mowhiti rakau hei ako i te rereketanga o te rangi. He kaha ia ki te whakamarama i te kai hei tikanga mo te patu i nga huakita kino. Patai: Ko wai te tangata i marenatia ia i muri i te 1966?
Ko Marshall