Dennis Rawlins (born 1937) is an American astronomer and historian who has built a reputation as a "professional skeptic" concerning astronomical and other claims. In his first book, Peary at the North Pole: fact or fiction? (1973), he argued that Robert Peary never made it to the North Pole at all. His second book was a catalog of all the stars observed by Tycho Brahe. In 1976, as the only astronomer on the Committee for Skeptical Inquiry, he looked into and debunked the so-called Mars effect. In 1996 he made headlines by publishing a report stating that Richard E. Byrd never managed to reach the North Pole but stopped short 150 miles from the pole.