Harry L. (Harry Levi) Hollingworth

Born in De Witt, Nebraska, in 1880, Harry Levi Hollingworth studied at the University of Nebraska and earned his Ph.D. at Columbia University in 1909. He spent most of his academic life at Barnard College and Columbia, where he became a leading figure in applied psychology and later served as president of the American Psychological Association.

Hollingworth is remembered as one of the early psychologists who showed how the field could be used outside the classroom and laboratory. His work explored topics such as advertising, vocational psychology, individual differences, and the effects of drugs like caffeine on performance. He was also an important builder of psychology at Barnard, helping shape the department there over several decades.

He published widely, wrote books on applied and clinical topics, and remained active in psychology well into the mid-20th century. Hollingworth died in 1956, but his work still stands out for connecting scientific psychology with practical questions from business, education, and everyday life.