B.F. Skinner was an American psychologist known for his work in behaviorism, a theory that focuses on observable behaviors rather than internal thoughts or feelings. He developed the concept of operant conditioning, which explains how behaviors can be modified through reinforcement or punishment. Skinner used devices like the Skinner box to study animal behavior, demonstrating how rewards can encourage certain actions. Skinner's research has had a significant impact on education and psychology. His ideas led to the development of techniques for behavior modification, which are used in various settings, including schools and therapy. His work continues to influence modern psychology and behavioral science.