Robert J. Havighurst was an American educator and expert on aging who developed the theory of developmental tasks. He proposed that there are certain tasks that must be achieved at each stage of life in order to successfully transition to the next stage. The document outlines Havighurst's biography and lists developmental tasks from babyhood through late adulthood, including learning to walk, developing social skills with peers, selecting a mate, raising children, and adjusting to retirement. The developmental tasks serve the purposes of informing individuals of societal expectations, motivating them to meet those expectations, and preparing them for what is to come at each life phase.