After the war, Calhoun Ancrum worked for the U.S. Allied Secretariat in Berlin and for the U.S. High Commissioner in Germany. On June 17, 1945 he married Princess Xenia Andreevna of Russia in a Russian Othodox ceremony. They had no children and divorced in 1954. Ancrum became a newspaper columnist. In 1970 he entered an Episcopal seminary and was ordained as a priest; he served as an assistant rector of the Old North Church in Boston.