Alfred Thayer Mahan (1840-1914) was a career officer in the United States Navy, attaining the rank of admiral on the retired list. He was the author of twenty books and 137 articles, mostly dealing with naval history and strategy and international relations. Francis P. Sempa is the author of Geopolitics: From the Cold War to the 21st Century, and has written articles on international relations for Strategic Review, The National Interest, and National Review. He is an Assistant United States Attorney for the Middle District of Pennsylvania and an adjunct professor of political science at Wilkes University.