John Harrington is the co-leader of Dentons’ US Tax practice, which was recognized by The Legal 500 in 2023 for outstanding work in international and non-contentious tax. Recognized by Chambers Global as a Notable Practitioner, he advises clients on inbound and outbound transactional and compliance issues; international tax legislative, regulatory and treaty matters; and a variety of domestic tax issues. John has extensive experience in dealing with the foreign tax credit, with subpart F and cross-border activities of companies and individuals and with other international tax issues.
Prior to joining Dentons, John served as international tax counsel for the Department of Treasury. There he worked closely with the Internal Revenue Service (IRS) in developing regulations and other administrative guidance. He represented the Treasury Department and worked with congressional committees and staff on tax treaties and international tax aspects of legislation. He has also played an active role in tax treaty negotiations, and in drafting technical explanations and revisions to existing treaties. John worked closely with tax officials in other countries and he served as the United States’ representative at meetings of the Organization for Economic Cooperation and Development (OECD) Committee on Fiscal Affairs and at World Trade Organization (WTO) meetings on tax-related trade disputes.
Before joining the Treasury Department, John was a tax counsel on the US House Committee on Ways and Means. On the committee staff, he was responsible for international, pass-through entities, financial institutions and products, real estate, environment, energy and other tax issues.
John is a frequent speaker and panelist at tax conferences.
