This document summarizes several learning theories and their key theorists that impact adult education, including behaviorism and cognitive learning theory. Behaviorism focuses on observable and measurable behaviors and uses reinforcement to encourage desired behaviors. Key behaviorist theorists discussed are Ivan Pavlov, John Watson, and B.F. Skinner. Cognitive learning theory takes into account mental processes and an individual's thoughts. Key cognitive theorists mentioned are Jean Piaget and Howard Gardner. Different classroom settings like traditional, online, hybrid, and self-directed are also compared in terms how these learning theories can be applied.