<prompt> Bhala okuqhubekayo kwalesi sigaba - Kusukela ngo-1948, uHenkin wasebenza ehhovisi leZizwe Ezihlangene loMnyango Wezwe wase-United States, lapho ayengomunye wabantu ababenomthwalo wemfanelo we-Convention Relating to the Status of Refugees ngo-1951, isivumelwano esabeka incazelo evunyelwene ngamazwe omhlaba yalokho okwenza umuntu abe umbaleki futhi sabeka izimfuneko zamazwe zokunikeza isiphephelo kubantu abakhethwe kanjalo. Washiya uMnyango Wezwe ngo-1956 ukuze afundise unyaka owodwa e-Columbia University ngesihloko sokuqedwa kwezikhali zenuzi okwaba isihloko sencwadi yakhe yango-1958 ethi Arms Control and Inspection in American Law. Wafundisa eNyuvesi yasePennsylvania kusukela ngo-1958, eqhubeka nomsebenzi wakhe owawushicilelwe ngokuthi The Berlin Crisis  <response>: neZizwe Ezihlangene ngo-1959 nencwadi ethi Ukuqedwa Kwezikhali: Izithakazelo Zommeli, eyakhishwa ngo-1964. 