Young American Foreign Service officers are accustomed to being teased by friends and relatives as to what they do in the “Foreign Legion” or the “Forest Service.” In the United States, unlike in many countries, the role of a professional diplomat is little known or understood. In A Professional Foreigner Edward Marks describes his life as an American diplomat who served during the last four decades of the twentieth century, from 1959 to 2001. Serving primarily in Africa and Asia, Marks was present during the era of decolonization in Africa (but always seemed to be at the opposite...