ˈæftɚɹ ɪnvɪtˈeɪʃənz tə lˈɛktʃɚɹ ˌɔn ˈiːst ˈeɪʒə æt vˈɛɹiəs ɐmˈɛɹɪkən jˌuːnɪvˈɜːsᵻɾiz, hiː wʌz ɐpˈɔɪntᵻd ɐ lˈɛktʃɚɹɚɹ æt kəlˈʌmbiə jˌuːnɪvˈɜːsᵻɾi ɪn nˈaɪntiːnhˈʌndɹɪd θˈɜːɾi sˈɛvən, ɐsˈoʊsɪˌeɪt pɹəfˈɛsɚɹ ʌv ˌɪntɚnˈæʃənəl ɹᵻlˈeɪʃənz ðɛɹ ɪn nˈaɪntiːnhˈʌndɹɪd θˈɜːɾi nˈaɪn, ænd pɹəfˈɛsɚɹ ɪn nˈaɪntiːnhˈʌndɹɪd fˈoːɹɾi θɹˈiː.
After invitations to lecture on East Asia at various American universities, he was appointed a lecturer at Columbia University in 1937, associate professor of International Relations there in 1939, and Professor in 1943.