H.A. Calahan was a naval officer and an influential American writer of instructional books on learning to sail; he wrote widely published books on everything from buying a boat, to rigging, to racing around the buoys to cruising.

Sailing Related Accomplishments and Honors
• Lieutenant Commander in United States Navy
• Author of approximately 14 books regarding sailing
o Learning to Sail (1932)
o Learning to Race (1934)
o Back to Treasure Island (1935)
o Yachtsman’s Omnibus: Learning to Sail, Learning to Race, Learning to Cruise (1935)
o Wind and Tide in Yacht Racing (1936)
o Ships’s Husband: A Guide yo Yachtsmen in the Care of Their Craft (1937)
o Gadgets and Wrinkles: A Compendium of Man’s Ingenuity at Sea (1938)
o So You’re Going to Buy a Boat (1939)
o Rigging (1940)
o What makes a war end? (1944)
o Learning to Cruise (1945)
o Geography for grown-ups (1946)
o Sailing technique (1950)
o The Heavens As a Guide: The Sky and the Sailor; A History of Celestial Navigation’ (1952)