Brendan Sponheimer

Brendan J. Sponheimer

Baker & McKenzie LLP


Brendan Sponheimer is an associate in the New York office of Baker McKenzie and a member of the Tax Practice Group. Prior to joining the Firm, Brendan was a Tax Controversy and Transfer Pricing Associate in New York, and an Attorney Advisor for Judge Joseph Robert Goeke of the United States Tax Court in Washington, D.C.

Practice Focus

Brendan focuses his practice on tax disputes and transfer pricing matters. He represents taxpayers at all levels of federal tax controversy, including IRS audits, administrative appeals, competent authority, and litigation before the United States Tax Court and United States Court of Federal Claims. His experience includes controversies with economic substance, substance-over-form, and transfer pricing issues.

Professional Associations and Memberships

  • American Bar Association, Tax Section


  • New York~United States (2012)
  • Connecticut~United States (2011)


  • Georgetown University Law Center (LLM, with distinction, Dean's List) (2011)
  • Western New England University School of Law (JD, cum laude) (2010)
  • Yale University (BA) (2007)


  • English


Author, "United States: Will the Supreme Court finally deflate the IRS's overblown AIA argument?," Baker McKenzie InsightPlus, 11 September 2020

Co-author, “Attorney-Client Privilege Claim Upheld in IRS Examination of Captive Insurance Company,” BNA Daily Tax Report, 12 April 2017

Co-author, “Looking for Clues in the IRS’s Campaign Announcement” BNA Daily Tax Report, 24 March 2017

Co-author, “IRS Continues Slicing Through Barrier Options” Law360: Expert Analysis, 3 December 2015


Speaker, “IRS Campaigns,” Tax Controversy Update: BNA Ethics & Tax Reform, May 2017

Speaker, “Revisiting the Approach to Developing Defensible Transfer Prices,” BNA Seminar: Practical Applications of Transfer Pricing Concepts, December 2016