pɹˈɛzɪdənt dʒˈɑːn ˈɛf. kˈɛnədiz sˈɛkɹətɹi ʌvðɪ ɪntˈɪɹiɚ, stˈuːɚt jˈuːdɔːl, dᵻskɹˈaɪbd hˌɪm æz "wˈʌn ʌvðə fˈaɪnɪst kˌɑːnsɚvˈeɪʃən spˈoʊksmɛn ʌv ˌaʊɚ pˈiəɹɪəd".
President John F. Kennedy's Secretary of the Interior, Stewart Udall, described him as "one of the finest conservation spokesmen of our period".