hiː dʒˈɔɪnd ðə kˈɛmɪstɹi dᵻpˈɑːɹtmənt æt jˈeɪl jˌuːnɪvˈɜːsᵻɾi æz ɐsˈɪstənt pɹəfˈɛsɚɹ ɪn nˈaɪntiːnhˈʌndɹɪd fˈɪfti wˈʌn, ænd wʌz pɹəmˈoʊɾᵻd tʊ ɐsˈoʊsɪˌeɪt pɹəfˈɛsɚɹ ɪn nˈaɪntiːnhˈʌndɹɪd fˈɪfti sˈɛvən ænd pɹəfˈɛsɚɹ ɪn nˈaɪntiːnhˈʌndɹɪd sˈɪksti.
He joined the Chemistry Department at Yale University as assistant professor in 1951, and was promoted to Associate Professor in 1957 and Professor in 1960.