Jonathan Sambur is a partner in Mayer Brown's Washington DC Tax Transactions practice. Jon’s practice is focused on U.S. federal tax issues affecting U.S. businesses operating outside the United States as well as U.S. federal tax issues affecting foreign businesses and individuals operating in the United States, including planning, structuring/restructuring, deferral/subpart F, foreign tax credit, tax treaties, legislative and regulatory work, and related controversy matters.

Jon works very closely with our Financial Services, Regulatory & Enforcement practice by providing U.S. federal income tax advice to non-U.S. financial institutions and non-U.S. investment funds, including advice related to the information reporting and withholding tax rules contained in recently-enacted Chapter 4 of the Internal Revenue Code (FATCA) and U.S. withholding tax/qualified intermediary (QI) issues. Jon frequently speaks to industry groups and writes articles on U.S. tax issues affecting non-U.S. financial institutions.

Prior to joining Mayer Brown, Jon was an attorney at the IRS Office of Associate Chief Counsel (International).

Spoken Languages

  • English


Brandeis University, BA

New York University School of Law, LLM, Taxation

Hofstra University School of Law, JD, with distinction
Dean's List
Member, Hofstra Labor and Employment Law Journal


  • District of Columbia
  • New York
  • Massachusetts


  • US Tax Court