ɪn nˈaɪntiːnhˈʌndɹɪd sˈɪksti fˈaɪv, hiː bɪkˌeɪm hˈɛd ʌvðə hɜːbˈɛɹiəm ænd ɐsˈɪstənt dᵻɹˈɛktɚ ænd bɪkˌeɪm dᵻɹˈɛktɚɹ ʌvðə ɹˈɔɪəl bətˈænɪk ɡˈɑːɹdənz, kjˈuː ɪn nˈaɪntiːnhˈʌndɹɪd sˈɛvənti sˈɪks.
In 1965, he became head of the herbarium and assistant director and became director of the Royal Botanic Gardens, Kew in 1976.