ɪn nˈaɪntiːnhˈʌndɹɪd fˈɪfti sˈɛvən, hiː wʌz kˈɔːld tə pˈæstɚ ðə hɪstˈɔːɹɪk fˈɜːst ɹᵻfˈɔːɹmd tʃˈɜːtʃ ʌv mˈaʊnt vˈɜːnən, nˈuː jˈɔːɹk ænd sˈuːn ɪnvˈaɪɾᵻd ɹˈɑːbɚtsən tə dʒˈɔɪn hˌɪm æz ɐsˈɪstənt pˈæstɚ.
In 1957, he was called to pastor the historic First Reformed Church of Mount Vernon, New York and soon invited Robertson to join him as assistant pastor.