He retired from the UN in 1966 to resume his teaching career at McGill University. He remained active in the promotion of human rights in Canada and internationally until his death at the age of 90. He was a director of the External link opens in new tab or windowInternational League for Human Rights; served as a member of the External link opens in new tab or windowRoyal Commission on the Status of Women; part of the team that launched External link opens in new tab or windowAmnesty International Canada; and, with colleagues from McGill University, was instrumental in creating the External link opens in new tab or windowCanadian Human Rights Foundation. He took part in a number of international commissions of inquiry, including a mission to the External link opens in new tab or windowPhilippines investigating human rights violations under External link opens in new tab or windowFerdinand Marcos. In External link opens in new tab or windowJapan he represented External link opens in new tab or windowKorean women forced to act as External link opens in new tab or windowsex slaves. He also campaigned for reparations for Canadian External link opens in new tab or windowprisoners of war under Japanese captivity.