Knight Dunlap (1875–1949) was an influential American psychologist and author, renowned for his contributions to experimental psychology and his critical views on introspection as a research method. Born on November 11, 1875, in Chatham, New Jersey, Dunlap completed his Ph.D. at Johns Hopkins University, where he later became a distinguished faculty member. His prolific career encompasses significant works that traverse both the empirical realms of psychology and the socio-cultural aspects of human behavior. One of his notable texts, 'Personal Beauty and Racial Betterment', encapsulates his diverse interests, blending scientific analysis with progressive discourse on the intersection of aesthetics, health, and eugenics. Dubbed somewhat controversial for its time, the book reflects the prevailing societal concerns of the early 20th century, intertwining them with empirical findings. Dunlap's writing style is characterized by a precise and scholarly tone, often combining rigorous data with broader philosophical enquiries. He maintained a clear emphasis on the practical applications of psychological research, contributing to the enhancement of educational methods, athlete training, and other facets of human efficiency. Whilst Dunlap's legacy in psychology is substantial, modern assessments of his work are mixed, particularly regarding his perspectives on eugenics and race. Nonetheless, his scholarly contributions have helped shape the contours of behavioral science and had a lasting influence on the field of psychology. Dunlap's work, which also includes titles such as 'An Outline of Psychobiology' (1914) and 'Habit Formation' (1932), remains a significant part of the historical tapestry of psychological research. (Boring, E. G. (1950). 'Knight Dunlap, 1875–1949', American Journal of Psychology, 63(1), 1-4.)