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Gregory S. Lynam is an experienced tax whistleblower attorney who handles tax claims and federal tax controversies at our office in Washington, D.C.

Mr. Lynam represents clients in cases involving federal tax controversies and tax appeals. He has maintained special attention in his career to international tax matters. Over the years, Mr. Lynam has served as a representative for numerous high net worth clients and multinational corporations, dealing with a wide variety of tax controversy cases both in litigation and with the Internal Revenue Service (IRS), including partnership disputes, interest allocations, R&E credits, tax-advantaged transactions, and matters involving transfer pricing. Many of his cases have involved refunds or deficiencies totaling between hundreds of millions and billions of dollars.

In his work before the IRS, Mr. Lynam has made IRS Whistleblower Office submissions and litigated award determinations from the IRS Whistleblower Office in U.S. Tax Court. He also handles tax disputes from the audit level through litigation and appellate review-including IRS appeals, competent authority, and alternative dispute resolution procedures. He regularly counsels taxpayers on steps to take before controversies with the IRS arise and strategic considerations with respect to filing claims for a refund.


  • LL.M, New York University School of Law, New York, New York - Taxation Specialty, 2001
  • J.D., University of Iowa College of Law, Iowa City, Iowa, Honors: With Distinction, 2000
  • B.S., Iowa State University, Ames, Iowa, 1996

Bar Admissions

  • U.S. Supreme Court
  • U.S. District Court Northern District of Illinois Trial Bar
  • U.S. Tax Court
  • U.S. Court of Appeals District of Columbia Circuit
  • U.S. Court of Appeals 5th Circuit
  • U.S. Court of Appeals 7th Circuit
  • U.S. Court of Appeals 8th Circuit
  • California
  • Illinois

Professional Associations

  • American Bar Association; Member - Tax Section
  • ABA Section of Taxation, Court Procedure & Practice Committee - TEFRA subcommittee, current chair
  • ABA Section of Taxation, Court Procedure & Practice Committee - Technology in the Courtroom subcommittee, immediate past chair
  • Illinois Bar Association
  • Chicago Bar Association
  • National Association of Criminal Defense Lawyers


The American Bar Association Section of Taxation named Mr. Lynam a John S. Nolan Fellow in 2006-2007. The American Bar Association and Tax Executives Institute (TEI) regularly invites him to speak on topics ranging from TEFRA partnership litigation to tax controversy management to advanced courtroom technology. Mr. Lynam is the current chair of the TEFRA subcommittee of the ABA Section of Taxation - Court Procedure & Practice committee, as well as the immediate past chair of the Technology in the Courtroom subcommittee.


Besides Mr. Lynam's non-docketed cases, his docketed casework includes representation for major corporations in tax-related matters including Exxon Mobil Corp.; Microsoft Corp.; Washington Mutual, Inc.; Capital One Financial Corp.; Black & Decker Corp.; Veritas Software Corp.; Compaq Computer Corp.; Bravo Restaurants Inc.; and more.

Community Involvement

In his award-winning pro bono practice, Mr. Lynam's focus has been on criminal law. One of his cases involved a post-conviction clemency grant in a death penalty case. He also obtained a not guilty verdict in a murder case involving a juvenile defendant.

Gregory S. Lynam

Gregory S. Lynam

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