B. F. Skinner is the most eminent psychologist of the twentieth century, and it is no exaggeration to say that his discovery of operant learning (conditioning) has influenced the broader field of psychology, as well as other disciplines, including education, neuroscience, and philosophy. Skinner's discovery and elucidation of operant learning has also had an immeasurable impact on our understanding of behavioural changes in infancy and childhood and on the treatment of behavioural disorders in children. In this article, I present the case that Skinner's discoveries and inventions have not only contributed to a scientific understanding of typical child development, but have also led to significant advances in the education, treatment, and care of children. In that regard, it could be argued that Skinner was an early childhood pioneer.