After a time at New College, Oxford, he moved to the University of Salamanca, where he became a friend of Miguel de Unamuno.
In 1909 he published Spain, a Study of her Life and Arts, the first work in English to recognize the genius of El Greco.
[2] In 1919 he joined the US delegation to the Paris Peace Conference, and in 1924 the League of Nations appointed him Financial Advisor to the government of Hungary.
[4] He spent most of World War II in Geneva, Switzerland, where he drew on his high-level, Europe-wide connections to perform vital work for the US intelligence network run by Allen Welsh Dulles.
[2] He spent his last years in Paris, first with the International Bank for Reconstruction and Development, then as European Representative of the National Committee for a Free Europe.