Robyn Mason Dawes (July 23, 1936[1] – December 14, 2010) was an American psychologist who specialized in the field of human judgment.[2] His research interests included human irrationality, human cooperation, intuitive expertise, and the United States AIDS policy. He applied linear models to human decision making, including models with equal weights,[3][4] a method known as unit-weighted regression. He co-wrote an early textbook on mathematical psychology[1] (see below).