Aaron Nielson is a professor at Brigham Young University Law School, where he focuses on administrative law, federal courts, and civil procedure. He recently served as Chair of the Administration and Management Committee of the Administrative Conference of the United States and on the Council of the American Bar Association’s Section of Administrative Law & Regulatory Practice; he currently co-chairs the Section's Antitrust & Trade Regulation Committee. Before joining the academy, he was an antitrust and appellate partner in the Washington, D.C. office of Kirkland & Ellis LLP, and remained of counsel after becoming a professor. He also has served as a law clerk to 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. He received a J.D. from Harvard Law School, an LL.M. from the University of Cambridge, and a B.A. from the University of Pennsylvania. In 2020, the U.S. Supreme Court appointed him to brief and argue Collins v. Yellen, a separation-of-powers case about the Federal Housing Finance Agency. In 2023, he took a leave of absence from BYU to serve as Texas Solicitor General.