Which theorist, along with B.F. Skinner, laid the groundwork for the theory of operant conditioning?

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Edward Thorndike, along with B.F. Skinner, laid the groundwork for the theory of operant conditioning. Thorndike's Law of Effect states that behavior that is followed by a satisfying outcome is more likely to be repeated, while behavior that is followed by an unsatisfying outcome is less likely to be repeated. Skinner built upon this by introducing the concept of reinforcement and punishment to shape and modify behavior.

Which Theorist, Along with B