ɐmˌʌŋ hɪz wˈɜːk wʌz mˈɛʒɚmənts ʌv vəlˈɑːsᵻɾiz ʌvðə mɐdʒɪlˈænɪk klˈaʊdz, ðə fˈɜːst sˈʌtʃ stˈʌdi ʌv ˈɛkstɹəɡɐlˈæktɪk vəlˈɑːsᵻɾiz.
Among his work was measurements of velocities of the Magellanic Clouds, the first such study of extra-galactic velocities.