KOHLBERG'S STAGES OF MORAL DEVELOPMENT. Lawrence Kohlberg was a moral philosopher and student of child development. He was director of. Learn more about kohlberg's stages of moral development in the Boundless open textbook. Kolhberg's theory of moral development states that we progress. Lawrence Kohlberg's stages of moral development constitute an adaptation of a psychological theory originally conceived by the Swiss psychologist Jean Piaget Stages · Theoretical assumptions · Examples of applied moral dilemmas.