Robert Colquhoun, Raymond Aron / Vol. 1, The Philosopher in History, 1905-1955, Beverly Hills, Calif.:  Sage Publications, 1986.

From the publisher:

The only book on Raymond Aron in English, Robert Colquhoun’s brilliant biography is an intellectual and literary tour de force. The first volume, The Philosopher in History, 1905-55, is examines the development of his philosophical stance in the turbulent years before the Second World War. It explores his opposition to Fascism and Communism and his achievement as a journalist and polemicist in the first decade of the Cold War.