hiː lˈeɪɾɚ lˈɛft nˈuː jˈɔːɹk sˈɪɾi təbi dᵻɹˈɛktɚɹ ʌvðɪ ˈɑːɹnəld ˈɑːɹboːɹˌɛɾəm æt hˈɑːɹvɚd ænd wˈɜːkt ðɛɹ ʌntˈɪl nˈaɪntiːnhˈʌndɹɪd fˈoːɹɾi ˈeɪt wɛn hiː dʒˈɔɪnd ðə smɪθsˈoʊniən ˌɪnstɪtˈuːʃən.
He later left New York City to be director of the Arnold Arboretum at Harvard and worked there until 1948 when he joined the Smithsonian Institution.