Justin F. Marceau

Professor; Director of Animal Law Program; Brooks Institute Endowed Faculty Research Scholar

  • Faculty

What I do

Director of Animal Law Program.


Animal Law, Criminal Law and Procedure, Constitutional Law, Environmental Law

Professional Biography

Justin F. Marceau is Professor of Law and the Animal Legal Defense Fund Professor. He serves as the reporter for the pattern criminal jury instruction committee of the U.S. Court of Appeals for the Tenth Circuit, and as an inaugural member of the animal welfare committee (PAW) formed by a proclamation of the Governor of Colorado to advise the First Gentleman on strategies for improving the protection of animals in Colorado. He is the recipient of numerous awards, including the Justice for Animals Award and the Colorado Criminal Defense Bar's Gideon Award.

Prior to coming to DU, Marceau was an assistant federal public defender specializing in capital habeas and a law clerk for the Ninth Circuit Court of Appeals. Before law school he spent a year living and working in Cairo, Egypt.

Marceau's research focuses on criminal law and constitutional law, particularly as those areas intersect with social change. He specifically writes in the areas of Habeas Corpus, Constitutional Law, and Animal Law. His current research is at the intersection of animal law and criminal law.

His work has appeared in some of the leading academic publications, including the Cambridge University Press, the Yale Law Review, and the Columbia Law Review. He has lectured on his research in the U.S. and in Europe, has been retained as an expert witness in criminal and civil cases, and received grants and awards for his research from a variety of organizations. He has also maintained a law practice while teaching at DU, representing indigent persons, persons sentenced to death, and a wide range of public interest non-profits. He also frequently authors or contributes to amicus briefs.

Marceau received a JD from Harvard Law School and a BA from Boston College. He enjoys running, wildlife viewing, and watching the Big Lebowski.

Licensure / Accreditations

  • California Bar
  • Supreme Court Bar

Featured Publications

Gideon's Shadow, 122 Yale Law Review 21 (2013).
Is Guilt Dispositive, 55 William and Mary Law Review 80 (2014).
Killing for your Dog, George Washington Law Review 69 (2014).