Cleve Lisecki

Cleve Lisecki is an adjunct professor in the University of Denver Graduate Tax Program, where he teaches International Taxation. He is licensed to practice law in New Jersey and New York and retired in 2025 after more than two decades at the IRS Office of Chief Counsel in Washington, DC, where he most recently served as a Branch Chief in the Office of Associate Chief Counsel (International). His earlier roles at Chief Counsel included Senior Counsel and Special Counsel (International) in the Large Business and International Division, and he served on detail as acting Program Manager for the Treaty Assistance and Interpretation Team (TAIT). His practice focused on international tax, particularly U.S. tax treaties and the taxation of U.S. territories.  Since leaving government service, Cleve has taught as a visiting professor at Penn State Dickinson Law (Fall 2025) and Washington & Lee University School of Law (Spring 2026), and as an adjunct professor at Villanova University Charles Widger School of Law (Fall 2025). From 2020 to 2025 he also taught federal income taxation as an adjunct at Northern Virginia Community College. Before joining the government, he was a Senior Tax Manager at KPMG LLP and a Tax Associate at Arthur Andersen LLP.

Cleve holds a B.S. in Accounting from the University of Delaware, a J.D. from Pace University Elizabeth Haub School of Law, and an LL.M. in Taxation from Georgetown University Law Center.