The DiSC model of behavior was first proposed by William Moulton Marston, a physiological psychologist with a Ph.D. from Harvard. His 1928 book, Emotions of Normal People, explains his theory on how normal human emotions lead to behavioral differences among groups of people and how a person’s behavior might change over time. He was interested in using practical explanations to help people understand and manage their experiences and relationships. We find DiSC to be an invaluable tool in our work with individuals and teams in helping to achieve the following objectives: