As the legal profession undergoes structural changes, longstanding principles of ethics still govern the day-to-day lives of practicing lawyers. This new Hornbook on professional responsibility provides both a snapshot of ongoing systemic changes and a thorough examination of the fundamentals of lawyer and judicial ethics. As a multi-dimensional work by scholarly experts in several fields, the Hornbook (1) begins with the changing environment in which legal services are provided in the modern economy; (2) continues with a theoretical grounding of legal ethics in moral philosophy; (3) offers empirical evidence and discussion about professional formation and moral development; (4) provides a comprehensive analysis of the law of lawyer ethics; (5) includes a rich discussion of the modern law of legal malpractice, and (6) concludes with exploration of the rules of judicial ethics.