Original: Its main influences were Ivan Pavlov , who investigated classical conditioning although he did not necessarily agree with Behaviourism or Behaviourists , Edward Lee Thorndike , John B. Watson who rejected introspective methods and sought to restrict psychology to experimental methods , and B. F. Skinner who conducted research on operant conditioning .
Simplified: People who inflouenced behaviorism a great deal were Ivan Pavlov , Edward Lee Thorndike , John B. Watson and B. F. Skinner .