Who was the most famous American psychologist?

One of the most famous American psychologists is B.F. Skinner, known for his work in behaviorism and operant conditioning. His research significantly influenced psychology, education, and behavior modification techniques. Skinner's theories emphasized the role of reinforcement in shaping behavior, making him a pivotal figure in understanding human and animal learning. His contributions have left a lasting impact on both psychology and broader cultural discussions about behavior.