Joseph Wolpe refined earlier techniques thirty years later, giving us:

1. One behavioural technique carries a specific origin story. 2. Jones developed early counterconditioning techniques. 3. Thirty years later, Joseph Wolpe refined those techniques. 4. That refinement gave us systematic desensitization. _Source: OpenStax Psychology 2e (CC BY 4.0), Ch 16 'Therapy and Treatment', sections 16.1-16.4_