Alex Sadler represents clients in complex tax controversies and litigation. He has litigated numerous tax cases in the US Tax Court, US Court of Federal Claims, and federal district and appellate courts, and has served clients in several extended tax trials. Alex has also helped clients resolve tax disputes in audits and administrative appeals with the Internal Revenue Service.
A focus of Alex’s practice is the research and development tax credit—a valuable corporate tax incentive. Alex is the author of the treatise “Legal Guide to the Research Credit” published by Thomson Reuters® and is a frequent speaker on the topic. He has litigated several research credit cases and helped clients resolve research credit issues with the IRS without litigation.
Alex was formerly a trial attorney with the Tax Division of the US Department of Justice, where he received the Attorney General’s Distinguished Service Award and the Tax Division’s Outstanding Attorney Award.
He has served as chair and vice chair of the DC Bar’s Tax Audits and Litigation Committee and is listed in Chambers USA, Washingtonian Top Lawyers Guide, and Washington DC Super Lawyers.
Note: This list includes engagements completed prior to joining Morgan Lewis.
Highly Regarded, Tax Controversy, District of Columbia, International Tax Review's World Tax Guide (2025)
Listed, The Best Lawyers in America, Tax Law, Washington, DC (2022–2025)
Listed, The Best Lawyers in America, Litigation and Controversy - Tax, Washington, DC (2023–2025)
Ranked, Tax, District of Columbia, Chambers USA (2010–2024)
Recommended, Tax - US Taxes - Contentious, The Legal 500 US (2017, 2019–2024)
Member, Practice Group of the Year, Tax, Law360 (2017)
Recognized, Washington DC Super Lawyers (2016)
Recognized, Washingtonian Top Lawyers Guide (2015)
Chair, Tax Audits & Litigation Committee, Tax Section, DC Bar (2014–2016)
Vice Chair, Tax Audits & Litigation Committee, Tax Section, DC Bar (2012–2014)
Member, Tax Section, American Bar Association
Member, Tax Section, Federal Bar Association