From 1934 to 1936 Hessen was a deputy director of the Physics Institute in Moscow headed by S.I. Vavilov.
fɹʌm nˈaɪntiːnhˈʌndɹɪd θˈɜːɾi fˈoːɹ tə nˈaɪntiːnhˈʌndɹɪd θˈɜːɾi sˈɪks hˈɛsən wʌzɐ dˈɛpjuːɾi dᵻɹˈɛktɚɹ ʌvðə fˈɪzɪks ˈɪnstɪtˌuːt ɪn mˈɑːskoʊ hˈɛdᵻd baɪ ˈɛs.ˈaɪ. vˈævɪlˌʌv.