In 1984, Carolyn Saarni published an important cross-sectional study on the development of children's expressive control. That paper, as with much of her early work, presaged interest in the development of emotion regulation and of the efforts to understand emotion regulation both in typical and at risk children. In this paper, we look back on Dr. Saarni's work on expressive control and studies that used her creative disappointment task. We discuss conclusions from that work and how this germinal work on expressive control contributed to the study of the broader concept of emotion regulation. We look ahead to the next steps that carry this line of research forward contributing to the development of emotional competence and mental health.