From 1950, Goldstein was a Senior Physicist at Nuclear Development Corporation of America, where he directed theoretical research on the shielding of nuclear reactors and on neutron cross sections of interest for reactor design.
Din 1950, Goldstein a fost cercetător senior la Corporation Nuclear Development of America, unde a efectuat cercetări teoretice privind ecranarea reactoarelor nucleare și a secțiunilor eficace de absorbție a neutronilor, temă de interes pentru proiectarea reactoarelor nucleare.