Rex Stockton and his research team have had a strong influence upon the research examining the self-talk of group leaders. Stockton recognized a need for such research from both his experience training group leaders and his reviews of relevant literature. As a result, he conducted a number of studies that examined the content of group leader self-talk, the role of experience and other factors in determining self-talk, the impact of self-talk on leader intervention selection, the role of leader intentions in intervention selection, and the manner in which leaders identify critical incidents. The major findings of the studies conducted by Stockton will be discussed, as will implications for training and future research.