George A. Kelly

American clinical psychologist who developed Personal Construct Theory — a radical constructivist framework in which every person acts as a scientist, constructing and testing hypotheses about their world through a system of personal constructs.

Proposed that all human behavior is guided by the anticipation of events through a hierarchical system of personal constructs (dichotomous templates for interpreting experience), and that psychological disorder arises when constructs fail to anticipate events — founding constructivist clinical psychology.