“…Ever the Skinnerian, Jack knew that increasing the precision with which we speak about a topic results in an increased understanding of that topic. It is not surprising, then, that perhaps his most important contribution was in further elucidating Skinner's analysis of verbal behavior, learning how to effectively teach such a difficult set of concepts, and providing a lab environment in which he could inspire additional research on and clinical applications of verbal behavior (Sundberg, 2017).…”