Beneath the popular conception of psychology is a foundation that is composed of mathematics. Unfortunately, few readily see the connection between the two disciplines. In fact, most students of psychology are astounded to discover that they must learn mathematics in order to understand psychology. Mathematics is used to express various psychological theories so that the information can be systematically organized and tested. Mathematics permeates several sub-disciplines within psychology, such as learning, intelligence, decision-making, and neuronal development. It is within this context that the future of psychology lays. This paper will explore the utility of mathematics to psychology, several applications of mathematics within psychology, and how mathematics and psychology, along with computer science, will become even more interdependent in the future.