Lawrence Kohlberg was a psychologist known for his extensive work on the development of moral reasoning and moral development. He built upon the earlier work of Jean Piaget and expanded our understanding of how individuals' moral thinking evolves over time. Some key findings and contributions of Kohlberg's work include:

1. Stages of Moral Development: Kohlberg proposed a theory of moral development consisting of six identifiable stages, grouped into three major levels: pre-conventional, conventional, and post-conventional. These stages describe the progression of moral reasoning from a focus on self-interest and obedience to higher levels of ethical and principled decision-making.
2. Moral Dilemmas: Kohlberg used moral dilemmas, such as the Heinz dilemma (involving a man who must decide whether to steal medicine to save his wife's life), to assess individuals' moral reasoning. He was interested in how people justified their decisions and the thought processes behind them.
3. Cognitive Development and Moral Development: Kohlberg's theory was deeply rooted in Piaget's cognitive developmental framework. He believed that moral development is closely tied to cognitive development, with individuals moving through stages as they gain the cognitive capacity for more advanced moral reasoning.
4. Moral Reasoning vs. Moral Behavior: Kohlberg primarily focused on the cognitive aspects of moral development, emphasizing moral reasoning and decision-making. He argued that moral behavior is influenced by moral reasoning but doesn't always align perfectly with it.
5. Moral Development Across Cultures: Kohlberg's theory originally had a Western bias in its formulation, but he later conducted cross-cultural research to examine whether his stages were applicable to individuals from various cultural backgrounds. He found that there is a universal progression in moral development, even though the content of moral values may vary across cultures.
6. Post-Conventional Morality: One of Kohlberg's most notable contributions is his description of post-conventional morality, which is characterized by an individual's adherence to abstract principles of justice and individual rights. It is often associated with a higher level of moral reasoning that transcends societal norms and laws.
7. Critiques and Controversies: Kohlberg's theory has faced criticism for being culturally biased, for emphasizing justice-based morality over care-based morality, and for its male-centered sample in the development of the stages. Scholars like Carol Gilligan have challenged some aspects of his theory.
8. Research on Moral Education: Kohlberg's work has had a significant influence on moral education. He believed that individuals could progress to higher stages of moral development through appropriate educational interventions and discussions of moral dilemmas. This led to the development of curricula and programs aimed at fostering moral development in children and adolescents.

Kohlberg's research remains influential in the fields of psychology, education, and ethics. While his theory has its critics and limitations, it has made a lasting impact on our understanding of how individuals develop their moral reasoning and values.