Thaddeus Edward Carhart (born February 16, 1950) is an American writer. He is the author of bestseller The Piano Shop on the Left Bank, a memoir of his experiences with pianos and his time spent in a Parisian piano atelier. His book Across the Endless River is a historical novel about Jean-Baptiste Charbonneau, the son of Sacagawea, and his intriguing sojourn as a young man in 1820s Europe.
