 While in the United States during the war, Maritain was active in the war effort, recording broadcasts destined for occupied France and contributing to the Voice of America. He continued to lecture and publish on a wide range of subjects—not only in political philosophy, but in aesthetics (e.g., Art and Poetry, 1943 [French original 1935]), philosophy of education, and metaphysics (De Bergson à St Thomas d’Aquin, 1944). Following the liberation of France in the summer of 1944, he was named French ambassador to the Holy See, serving until 1948, but was also a member of (and, for a time, Head) of the French delegation to UNESCO, and was importantly involved in the promotion and, indirectly, in the drafting of the United Nations Universal Declaration of Human Rights (1948).