Abraham Maslow was an American psychologist best known for creating Maslow's Hierarchy of Needs, a theory that outlines human motivation through a five-tier model of human needs. This model illustrates how individuals are driven to fulfill basic physiological needs before progressing to higher-level psychological needs such as love, esteem, and self-actualization. His work emphasizes the idea that motivation is essential in understanding consumer behavior, as individuals make purchasing decisions based on their current needs in the hierarchy.