Katrin Marquez is an attorney at the Institute for Justice and IJ’s current Elfie Gallun Fellow in Freedom and the Constitution. She previously served as a Dave Kennedy Fellow in the Florida office and as a Constitutional Law Fellow at headquarters. She returned to IJ after clerking for Judge James C. Ho of the U.S. Court of Appeals for the Fifth Circuit and Judge Roy K. Altman of the U.S. District Court for the Southern District of Florida.
Katrin earned her law degree from Yale Law School, where she was a Coker Fellow in Constitutional Law and a Knight Law & Media Scholar with the Media Freedom and Information Access Clinic. She was also the executive editor in charge of Inter Alia, an online publication of the Yale Law & Policy Review.
Katrin earned her B.A. in political science and Asian languages and civilizations from Amherst College and her M.S.Ed. in education policy from the University of Pennsylvania Graduate School of Education. After college, she spent two years teaching English in Gwangju, South Korea as a Fulbright Fellow.
Katrin lives in Miami, where she grew up after immigrating from Cuba as a young child.
Katrin's Cases
Private Property | Zoning Justice Project
Retiree’s Construction of Dream Home Blocked by Nonsensical Zoning from City After Decades of Planning
Art Yatsko has been working towards a dream for the last 20 years. Bust as Art was ready to begin construction, he was told he could no longer build a modest single-family home in his…
Wyoming Families Head to Court to Keep Education Choice Program Alive
Wyoming families intervene to defend education savings accounts for parents who choose alternatives to public school.
4th Amendment Project | Economic Liberty | Private Property
Small Businesses Threatened by Financial Surveillance Order File Suit Against the Federal Government
Money services businesses challenged a federal surveillance order requiring reports on low-dollar cash transactions near the southwest border.
Immunity and Accountability | Private Property
Woman Seeks to Hold Police Accountable for Mistaken Identity Arrest
An innocent Texas woman was arrested in a case of mistaken identity while getting off a cruise in 2022. Now, she's suing Broward County for the unconstitutional arrest.
Economic Liberty | Private Property | Small and Home-Based Business | Zoning Justice Project
Michigan Couple File Lawsuit Against Brooks Township For Violating Michigan Constitutional Right To Open Business
A Michigan couple fight Brooks Township's ban on new cemeteries, enacted specifically to stop them from opening a conservation burial ground on their own property.
Commercial Speech | First Amendment
Owner of medical cannabis dispensary files federal lawsuit challenging Mississippi's ban on truthful advertising
If it’s legal to sell a product, it’s also legal to talk about that product. But not in Mississippi—at least not if the product is medical marijuana. In 2022 Mississippi joined the growing number of…
Food-Truck Owners Battle City’s Anti-Competitive Ordinance
Tarpon Springs, Florida bans food trucks from operating in the downtown area, unless the owner also has a brick-and-mortar restaurant. The owners of one food truck are working with IJ to fight for their right…
Katrin's Amicus Briefs
Roberts v Thompson
United States Court of Appeals for the 8th Circuit
Monroe v. Conner
United States Supreme Court
Brown v. Pouncy
United States Supreme Court
Cedar Point Nursery v. Hassid
U.S. Supreme Court
Katrin's News, Articles & Publications
Katrin's Podcasts
December 05, 2025
Short Circuit 405 | Judges as Employers
What happens if you sue your employer and your boss’s boss is a federal judge? It’s kind of complicated. Aliza Shatzman of the Legal Accountability […]
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