During his studies Goldberg spent two years visiting Stanford University from 1964 to 1966 .
During his studies Goldberg eventually finished his Ph. D. in 1967 with a thesis on tryptophan synthase .
During his studies Goldberg spent two years visiting Stanford University from 1964 to 1966 , and eventually finished his Ph. D. in 1967 with a thesis on tryptophan synthase .