For over a century, administrative agencies have taken a massive role in government, carrying out extensive executive, legislative and adjudicatory roles. Indeed, working in many fields of law -- from environmental law, tax law to criminal law, requires an extensive understanding of how administrative agencies operate, and how private entities communicate, operate and, if necessary, challenge their decisions. This is the universal experience of all developed nations. This course focuses on federal administrative agencies, exploring their nature and functions and the various legal controls on their action. Among the topics covered are the status of administrative agencies in the constitutional framework of separation of powers; agency rulemaking and adjudication; and the availability, timing, and scope of judicial review of agency action. Time permitting, some comparative legal viewpoints will be presented.