author
Truman Lee Kelley
1884–1961
A pioneering American psychologist and statistician, he helped bring rigorous measurement into the study of human abilities. His work on psychometrics and factor analysis shaped how intelligence and educational testing were understood in the early 20th century.
1 Audiobook
Stanford Achievement Test, Ed. 1922 : Advanced Examination, Form A, for Grades 4-8
by Truman Lee Kelley, G. M. (Giles Murrel) Ruch, Lewis M. (Lewis Madison) Terman
About the author
Born in Whitehall, Michigan, Truman Lee Kelley was an American researcher whose career connected mathematics, psychology, and statistics. Sources describe him as highly influential in introducing statistical methods into psychological research and as an important early figure in psychometrics.
He studied mathematics at the University of Illinois, later earned graduate degrees in psychology, and went on to build a reputation for careful, quantitative work. He is especially associated with early factor analysis and with efforts to make mental testing and educational measurement more precise and reliable.
Kelley's writing and research helped set standards for how psychologists analyzed ability, test scores, and individual differences. Though less widely known outside specialist circles today, he remains an important historical figure in the development of modern psychological measurement.