Sean Hayes focuses his practice on complex, high-profile investigations, especially those conducted by the US Congress. His decade of federal government experience has included responding to and conducting congressional inquiries across industries and issues. 

As director of oversight for the US Department of Health and Human Services, Mr. Hayes handled investigations and information requests by Congress, the US Government Accountability Office, the Department of Justice, and the inspectors general. He worked closely with the Centers for Medicare and Medicaid Services, the National Institutes of Health and the Food and Drug Administration to draft and coordinate responses to investigations and policy requests. Mr. Hayes also worked closely with the Office of the Inspector General of the Department of Health and Human Services on shared initiatives.  

Mr. Hayes previously served as staff director of the Subcommittee on Healthcare, Benefits and Administrative Rules for the US House of Representatives Committee on Oversight and Government Reform, where he led all healthcare-related investigations, including oversight of the Patient Protection and Affordable Care Act (PPACA), the Internal Revenue Service’s implementation of the PPACA and the committee’s bipartisan review of pharmaceutical drug pricing. He also conducted joint investigations into the Federal Deposit Insurance Corporation and the Export-Import Bank of the United States. 

As deputy chief of oversight for the House Committee on Energy and Commerce, Mr. Hayes handled a wide range of issues spanning the committee’s jurisdiction, including the launch of, the GM ignition switch recall, the government’s response to prescription drug and opioid abuse, federal standards on cybersecurity, and the committee’s 21st Century Cures initiative.

Prior to his government service, Mr. Hayes worked in-house at a Washington DC–based law firm, where he assisted the election law, investigations and telecommunications practice groups. He also served as associate counsel for the Republican National Committee for the 2008 election. 

Insights & News


  • Education

    • JD, Stanford University Law School, 2006

      Production Editor, Stanford Journal of Law, Business and Finance
    • BA, Fairfield University, 2003

      Valedictorian Speaker, Editor-in-Chief, The Fairfield Mirror

  • Admissions

    • District of Columbia



Unless you are an existing client, before communicating with WilmerHale by e-mail (or otherwise), please read the Disclaimer referenced by this link.(The Disclaimer is also accessible from the opening of this website). As noted therein, until you have received from us a written statement that we represent you in a particular manner (an "engagement letter") you should not send to us any confidential information about any such matter. After we have undertaken representation of you concerning a matter, you will be our client, and we may thereafter exchange confidential information freely.

Thank you for your interest in WilmerHale.