ɪn nˈaɪntiːnhˈʌndɹɪd sˈɪksti sˈɪks, hiː wʌz ɹᵻkɹˈuːɾᵻd baɪ ðɪ ˌɪnfluːˈɛnʃəl ˈɑːɹt kɹˈɪɾɪk dˈoːɹ ˈæʃtən tə tˈiːtʃ ˈɑːɹt hˈɪstɚɹi æt ðə skˈuːl ʌv vˈɪʒuːəl ˈɑːɹts ɪn nˈuː jˈɔːɹk.
In 1966, he was recruited by the influential art critic Dore Ashton to teach art history at the School of Visual Arts in New York.