Who was the first behavioral psychologist to use counterconditioning techniques?

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Mary Cover Jones was the first behavioral psychologist to use counterconditioning techniques in her famous study on the treatment of a young boy's fear of rabbits. Joseph Wolpe developed systematic desensitization as a form of counterconditioning, but he came after Mary Cover Jones. Aaron Beck and Albert Ellis developed cognitive behavioral therapy rather than behavioral techniques.

Who Was the First Behavioral Psychologist to Use Counterconditioning Techniques