lˈændsbɜːɡ bɪkˌeɪm ðɪ ˈæktɪŋ dᵻɹˈɛktɚɹ ʌvðə dʒˈɔɪnt ɹᵻsˈɜːtʃ ænd dɪvˈɛləpmənt bˈoːɹdz kəmˈɪɾi ˌɔn dʒˌiːoʊfˈɪzɪkəl sˈaɪənsᵻz nˈaɪntiːnhˈʌndɹɪd fˈoːɹɾi sˈɪks ænd ðˈɛn ðə dᵻɹˈɛktɚ nˈaɪntiːnhˈʌndɹɪd fˈoːɹɾi nˈaɪn.
Landsberg became the acting director of the Joint Research and Development Board's Committee on Geophysical Sciences (1946) and then the director (1949).