John Watson was a prominent American psychologist known for founding the school of behaviorism. He believed that psychology should focus on observable behaviors rather than internal thoughts and feelings. Watson's famous experiments, such as the Little Albert study, demonstrated how emotions could be conditioned through environmental stimuli. His work laid the groundwork for modern psychological practices and influenced various fields, including education and therapy. Watson's ideas challenged traditional views of psychology, emphasizing the importance of the environment in shaping behavior. He argued that by understanding and manipulating external factors, we could predict and control behavior. This approach has had a lasting impact on psychology, leading to advancements in areas like behavioral therapy and learning theory.