He is psychologist and behaviorist known for his influential work in operant conditioning, emphasizing the role of reinforcement in shaping behavior.

The person you are referring to is B.F. Skinner. He is a renowned psychologist and behaviorist who is well-known for his extensive research and theories on operant conditioning. Skinner emphasized the significance of reinforcement in determining and shaping behavior. His work greatly influenced the field of psychology and his concepts are widely used in different areas, such as education, therapy, and animal training.