Rubuta ci gaba don wannan sakin layi - Farawa a 1948, Henkin ya yi aiki a ofishin Majalisar Dinkin Duniya na Ma'aikatar Harkokin Wajen Amurka, inda ya kasance daya daga cikin mutanen da ke da alhakin Yarjejeniyar da ta shafi matsayin 'yan gudun hijira a 1951, yarjejeniyar da ta kafa yarjejeniyar da aka amince da ita a duniya game da abin da ke zama' yan gudun hijira kuma ya kafa bukatun da ake bukata ga kasashe don ba da mafaka ga mutanen da aka zaba. Ya bar Ma'aikatar Harkokin Waje a shekarar 1956 don koyarwa na shekara guda a Jami'ar Columbia kan batun kwashe makaman nukiliya wanda ya zama batun littafinsa na 1958 "Arms Control and Inspection in American Law". Ya koyar a Jami'ar Pennsylvania farawa a 1958, ci gaba da aikinsa da aka buga a matsayin "The Berlin Crisis
da Majalisar Dinkin Duniya" a 1959 da kuma littafin "Disarmament: Sha'awar Lauyan", wanda aka saki a 1964.