is a U.S. born psychologist involved in subjects from sex differences and psychological characteristics, who lived from 1899 to 1994. Baylet was awarded her Ph.D in 1926, from the University of Iowa. Bayley's best known contribution to psychology is likely the Bayley Scale of Infant and Toddler Development. Bayley spent most of her career at the Universityof California but did spend 10 years as the Chief of the Section on Child Development at the National Institute of Mental Health. Bayley was the first woman to receive the American Psychological Association's Distinguished Scientific Contribution Award, in 1966.