Serious research into corporate ethics is nearly half a century old. Two approaches have dominated research; one is normative, the other empirical. The former, the normative approach, develops theories and norms that are prescriptive, that is, ones that are designed to guide corporate behavior. The latter, the empirical approach, investigates the character and causes of corporate behavior by examining corporate governance structures, policies, corporate relationships, and managerial behavior with the aim of explaining and predicting corporate behavior. Normative research has been led by scholars in the fields of moral philosophy, theology and legal theory. Empirical research has been led by scholars in the fields of sociology, psychology, economics, marketing, finance, and management. While utilizing distinct methods, the two approaches are symbiotic. Ethical and legal theory are irrelevant without factual context. Similarly, empirical theories are sterile unless translated into corporate guidance. The following description of the history of research in corporate ethics demonstrates that normative research methods are indispensable tools for empirical inquiry, even as empirical methods are indispensable tools for normative inquiry.