(1824–1888)
Eli Todd Tappan was an American educator, mathematician, author, lawyer and newspaper editor who served as president of Kenyon College, among other public distinctions. He was the son of Senator Benjamin Tappan and the father of author Mary Tappan Wright.
After the death of Joseph Ray, writer of numerous mathematics textbooks from primary through college levels, Eli Tappan authored several updated editions of Ray's texts for various publishers.