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William J. Haun

Associate, Hunton & Williams LLP
William Haun

William Haun is an associate in the Washington, D.C. office of Hunton & Williams. He will serve as a law clerk to Judge Janice Rogers Brown of the U.S. Court of Appeals for the D.C. Circuit for the 2016-2017 term. Mr. Haun's practice includes drafting amicus curiae briefs before the Supreme Court of the United States and the Courts of Appeals in prominent cases, including Robert F. McDonnell v. United States and Zubik (Little Sisters of the Poor) v. Burwell.

Prior to joining Hunton & Williams, Mr. Haun served as a law clerk to the Honorable Claude M. Hilton of the U.S. District Court for the Eastern District of Virginia. While in law school, Mr. Haun worked as a research assistant to Law Professor Mark L. Rienzi, assisting in his First Amendment and religious liberty scholarship and litigation in trial and appellate courts.

Mr. Haun is widely published on issues of constitutional law, including the First Amendment, separation of powers, federalism, and administrative law issues. His articles have appeared in National Affairs, the Catholic University Law Review, Forbes online, and the Federalist Society’s practice journal, among other outlets. He also co-authored a book chapter on the separation of powers and administrative agencies with former U.S. Congressman David McIntosh. Mr. Haun’s legal scholarship is cited by lead articles in the Emory Law Journal and the Houston Law Review, in a report on “Cooperative Federalism” from members of the U.S. Senate Committee on the Environment and Public Works, and is included among continuing-legal-education materials on criminal law and the administrative state offered by the Administrative Conference of the United States.


The Federalist Society takes no position on particular legal or public policy issues. The people listed as Experts have spoken or otherwise participated in Federalist Society events, publications, or multimedia presentations. A person's appearance on this list does not imply any other endorsement or relationship between the person and the Federalist Society. All expressions of opinion by an expert are those of the expert.

Publications and Multimedia
Supreme Court to Consider Honest-Services Fraud: Oral Arguments Heard in Robert F. McDonnell v. United States - Podcast
Criminal Law & Procedure and Free Speech & Election Law Practice Groups Podcast
April 27, 2016
Supreme Court to Consider Honest-Services Fraud: Robert F. McDonnell v. United States - Podcast
Criminal Law & Procedure Practice Group Podcast
February 10, 2016
The “Mens Rea” Component Within the Issue of the Over-Federalization of Crime
Engage Volume 14, Issue 2 July 2013
November 05, 2013
The EPA's Anticipated Attempt to Regulate Greenhouse Gas Emissions from Existing Power Plants - Podcast
Environmental Law & Property Rights Practice Group Podcast
March 25, 2013
The Philosopher in Action: A Tribute to the Honorable Edwin Meese III
Engage Volume 13, Issue 1, March 2012
March 22, 2012