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Justin Marceau

Justin Marceau is a law professor at the University of Denver, where he specializes in animal law and criminal law. He has authored, co-authored, or edited three books with Cambridge University Press, including the award-winning book Truth and Transparency: Undercover Investigations in the Twenty-First Century (2023) (with Alan Chen). Justin has authored more than 50 academic articles, has litigated a variety of animal protection cases, and is involved in a variety of legislative efforts.

Before becoming interested in animal law, Justin worked as a capital defense lawyer. He continues to teach and research on topics relating to civil rights and criminal law, in addition to directing the animal law program at the University of Denver. Most recently, Justin helped found the Animal Activist Legal Defense Project, a legal clinic for activists facing criminal charges.

Latest articles by Justin Marceau

Future Perfect
Can dogs be considered “persons” under the law ?Can dogs be considered “persons” under the law ?
Future Perfect

The very old law that might just save these beagles.

By Angela Fernandez and Justin Marceau
43 lab monkeys escaped in South Carolina. They have a legal claim to freedom.
Future Perfect

Who owns the escaped monkeys now? It’s more complicated than you might think.

By Angela Fernandez and Justin Marceau
Future Perfect
The Supreme Court’s ruling on Prop 12 is a win against factory farming. But the pigs’ lives will still suck.The Supreme Court’s ruling on Prop 12 is a win against factory farming. But the pigs’ lives will still suck.
Future Perfect

Upholding Prop 12 could create a bold new era of animal advocacy, but only if we go further.

By Justin Marceau and Doug Kysar

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