A. T. (Alfred Thayer) Mahan

Born at West Point, New York, in 1840, Alfred Thayer Mahan became a U.S. Navy officer, educator, and historian whose ideas about maritime power made him one of the most influential strategic writers of his era. He served during the Civil War and later taught at the Naval War College, where his lectures helped form the basis of his most famous books.

His breakthrough work, The Influence of Sea Power upon History, 1660–1783 (1890), argued that national strength depends heavily on naval force, commerce, and command of sea routes. The book gained rapid attention in the United States and Europe, and his later writings continued to explore naval strategy, international politics, and the relationship between military power and trade.

Although he was a career naval officer, Mahan is remembered even more for the reach of his ideas than for his sea service. His work influenced political and military leaders around the world, and he remains a central figure in the history of naval thought and grand strategy.