Adam S. Halpern

Chair, Tax

Mountain View 650.335.7111


Adam Halpern is the Chair of the Tax Group at Fenwick & West LLP. His practice focuses on the U.S. federal income taxation of international transactions. He regularly advises on the taxation of cross-border operations, acquisitions, dispositions and restructurings. He has successfully represented clients in federal tax controversies at all levels.

Adam is a lecturer in law at Stanford Law School, teaching classes in international tax, and is a frequent speaker at TEI and PLI.

Adam is recognized as a leading tax lawyer by Euromoney's World’s Leading Tax Advisors, International Tax Review and Chambers USA.

The Fenwick & West Tax Group has advised over 100 Fortune 500 companies on tax matters, and has served as counsel in more than 150 large-corporate IRS Appeals proceedings and more than 75 federal court tax cases. Recent published cases include Analog Devices, Inc. v. Commissioner, 147 T.C. No. 15 (2016), CBS Corp. v. United States, 2012-1 U.S.T.C. ¶50,346 (Fed. Cl.), and th​e landmark Xilinx, Inc. v. Commissioner, 125 T.C. 37 (2005), aff’d, 598 F.3d 1191 (9th Cir. 2010), described by the Wall Street Journal as “the biggest tax case in the last 20 years.”

Fenwick has been named San Francisco Tax Firm of the Year and U.S. Tax Litigation Firm of the Year numerous times by International Tax Review.​​​​​​