サンフランシスコ会議
Welles became a prominent commentator and author on foreign affairs. In 1945, he joined the [[American Broadcasting Company]] to guide the organization of the "Sumner Welles Peace Forum," a series of four radio broadcasts providing expert commentary on the [[United Nations Conference on International Organization|San Francisco Conference]], which wrote the founding document of the [[United Nations]]. He undertook a project to edit a series of volumes on foreign relations for [[Harvard University Press]].