Nolan Cathal J. Nolan 
Notable U.S. Ambassadors Since 1775 [PDF ebook] 
A Biographical Dictionary

This book spans more than 200 years of U.S. diplomatic history. Its geographical scope widens along with the expanding interests of America itself, from initial exclusive concern with the empires of Europe, to the emerging nations of Latin America, to the commercial opportunities and geopolitical concerns of Asia and Africa. The ambassadors chosen for inclusion reflect these historical changes in American foreign relations. Organized alphabetically, the biographies present an implicit account of the evolution of the U.S. diplomatic service, from its founding and early principles through the 20th century evolution of its habits and culture.