Aaron L. Nielson

Professor Aaron Nielson lectures and writes in the areas of administrative law, civil procedure, and federal courts. Before joining the faculty, he served as Solicitor General of Texas and represented Texas before the U.S. Supreme Court and the Texas Supreme Court, as well as overseeing all appellate litigation for the State. Earlier in his career, he was a professor at Brigham Young University and an appellate and antitrust partner in the Washington, D.C. office of Kirkland & Ellis LLP. He also clerked for Justice Samuel A. Alito, Jr. of the U.S. Supreme Court, Judge Janice Rogers Brown of the U.S. Court of Appeals for the D.C. Circuit, and Judge Jerry E. Smith of the U.S. Court of Appeals for the Fifth Circuit.

As Solicitor General, Professor Nielson successfully defended against a First Amendment challenge Texas’s law requiring online pornographers to institute age verification. In 2020, the U.S. Supreme Court appointed him to defend the constitutionality of a federal agency. He currently serves as a Senior Fellow of the Administrative Conference of the United States after completing a six-year term as an appointed public member and chair of the Conference’s Administration & Management Committee.

Nielson’s research currently focuses on administrative law, federal litigation, and the separation of powers. He has published in the University of Chicago Law Review, University of Pennsylvania Law Review, Duke Law Journal, Georgetown Law Journal, Texas Law Review, Cornell Law Review, Northwestern University Law Review, and Vanderbilt Law Review, among others. Nielson has been recognized for teaching for teaching and scholarship and in 2021 received the Federalist Society’s Joseph Story Award, which recognizes a young academic for excellence in legal scholarship, a commitment to teaching, and a concern for students, and who has made a significant public impact in a manner that advances the rule of law in a free society. He is also an elected member of the American Law Institute.

Professor Nielson received his J.D. magna cum laude from Harvard Law School and an LL.M from the University of Cambridge, where he focused his studies on the institutions that regulate global competition and commerce. He received his undergraduate degree summa cum laude from the University of Pennsylvania, majoring in economics and political science.