William J. Haun

William Haun

William J. Haun is a lawyer in Washington, D.C., with experience litigating complex matters involving federal regulation, administrative law, and commercial disputes.  In private practice at Hunton & Williams LLP, Will represented prominent clients--including elected officials, business leaders, and constitutional law scholars--in respective amicus efforts before the U.S. Supreme Court in Robert F. McDonnell v. United States (a major challenge to federal public corruption laws) and Zubik (Little Sisters of the Poor) v. Burwell (a religious liberty challenge to the HHS mandate under the Affordable Care Act).  Will also successfully represented business clients in complex litigation matters crossing multiple federal and state courts, as well as in state, federal, and international government investigations.  His business litigation and investigation experience involves antitrust law, RICO, the Foreign Sovereign Immunities Act, the federal removal statute, and commercial law issues.  Will's widely-cited legal scholarship includes articles on EPA regulation of greenhouse gas emissions from existing power plants, a book chapter on the separation of powers and administrative law (co-authored with former Congressman David McIntosh), multiple articles on federal criminal justice reform, and assessments of free speech and religious liberty law.  His articles have appeared in ForbesNational AffairsNational Review OnlinePublic Discourse, and law reviews.  In addition to his work in private practice,  Will's experience also includes federal judicial clerkships, in addition to serving as an attorney-advisor to an administrative law judge at the U.S. Department of Labor. 

Will received his Juris Doctor with honors from the Catholic University of America, Columbus School of Law, where he was a published member of the Catholic University Law Review, an executive editor of the Harvard Journal of Law & Public Policy, an award-winning chapter president of the Federalist Society, and a research and teaching assistant to law professor (and Becket Fund Senior Counsel) Mark Rienzi.  He received his Bachelor of Arts in political science with honors from American University.  He is a recipient of the William Randolph Hearst Foundation's U.S. Senate Youth Scholarship, a former John Marshall Fellow of the Claremont Institute, a member of the Georgetown Law Supreme Court Institute, and a member of Board of Directors for Boys Town, Washington, D.C.

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Publications and Multimedia
Supreme Court Rules on Honest-Services Fraud: Robert F. McDonnell v. United States - Podcast
Criminal Law & Procedure and Free Speech & Election Law Practice Groups Podcast
June 29, 2016
McDonnell v. United States - Post-Argument SCOTUScast
SCOTUScast 5-13-16 featuring William Haun
May 13, 2016
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