Sean Lyons is an associate in White & Case's Tax Controversy group, based in Washington, DC. Sean's practice focuses on representing taxpayers in proceedings before the Internal Revenue Service, at both the examination and appeals levels. He has also represented taxpayers in deficiency litigation before the US Tax Court and in refund litigation in the US District Courts. Sean also routinely advises clients on international tax matters, with an emphasis on transfer pricing and tax treaty issues.

In addition to his tax controversy practice, Sean advises taxpayers on the tax implications of customs and trade issues. He works closely with the Firm's Trade team to provide comprehensive advice regarding duties and tariffs.

Sean also supports the Firm's sponsorship of the Phillip C. Jessup International Law Moot Court Competition, regularly serving as a judge in the international rounds. Sean is a member of the J. Edgar Murdock Inn of Court at the US Tax Court.

Sean received his BA, with distinction, from the University of Virginia College of Arts and Sciences, and his JD from the University of Virginia School of Law. Sean is admitted to practice before the US Tax Court and the US District Courts for the District of Columbia and the Western District of Texas.