hiː wʌzɐ mˈɛmbɚɹ ʌv sˈɛvɹəl lˈɜːnd səsˈaɪəɾiz, ænd wʌz pɹˈɛzɪdənt ʌvðɪ ɐsˌoʊsɪˈeɪʃən ʌv tɹˈɑːpɪkəl bˈɑːtəni fɹʌm nˈaɪntiːnhˈʌndɹɪd sˈɛvənti tə nˈaɪntiːnhˈʌndɹɪd sˈɛvənti wˈʌn, ænd ʌvðə bətˈænɪkəl səsˈaɪəɾi ʌvðə bɹˈɪɾɪʃ ˈaɪəlz ɪn nˈaɪntiːnhˈʌndɹɪd ˈeɪɾi tˈuː.
He was a member of several learned societies, and was president of the Association of Tropical Botany from 1970 to 1971, and of the Botanical Society of the British Isles in 1982.