Final answer:
B.F. Skinner was the psychologist most interested in studying learned behavior. He focused on studying overt behavior and the impact of consequences on behavior.
Step-by-step explanation:
The person most interested in studying learned behavior was B.F. Skinner. Skinner was an influential American psychologist and a key figure in behaviorism. He focused on studying overt behavior and the impact of consequences, such as reinforcement and punishment, on behavior. Skinner's research on operant conditioning and his development of the Skinner box were significant contributions to our understanding of behavior.