Morton W. Weir, born July 18, 1934, in Canton, Illinois, is an experimental psychologist and academic.
After earning a BA from Knox College and an MA and PhD from the University of Texas at Austin, he joined the department of psychology at the University of Illinois at Urbana-Champaign in 1960 and subsequently served in a number of administrative capacities, retiring from the chancellorship in 1993.
Weir graduated cum laude from Knox College in 1955 as a pre-medicine major.
His research and scholarship included learning and problem solving with children, behavioral genetics, and social policy.
He served on a number of editorial boards of scientific journals; the National Research and Evaluation Advisory Committee, Project Head Start; the Developmental Behavioral Sciences Study Section, National Institutes of Health; commissioner and president, North Central Association of Colleges and Schools; and on a number of other professional boards and committees.