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Diana L. Erbsen

Diana L. Erbsen

Partner
Diana is a brilliant lawyer who can navigate complex tax issues.
Chambers USA 2023
About

Diana Erbsen has more than two decades of experience in tax controversy, representing clients in all aspects of sophisticated, challenging, and often high stakes tax disputes. In 2014, Diana was appointed to the position of Deputy Assistant Attorney General for Appellate and Review for the Tax Division of the US Department of Justice by President Obama. Following the end of the administration on January 20, 2017, Diana returned to DLA Piper as a partner.

In her capacity as a Presidential appointee to the DOJ's Tax Division, Diana oversaw its largest section, the Appellate Section (which is responsible for all appellate litigation, including to the Supreme Court), the Office of Review (which is responsible for civil settlements), and the Financial Litigation Unit (a unit tasked with collecting judgments secured by the Trial Sections of the Tax Division). Additionally, she was actively involved in the management and operations of the Civil and Criminal sections of the Tax Division and served in an ex officio capacity on the Bankruptcy Rules Advisory Committee. In January 2017, Diana was recognized by IRS Chief Counsel William Wilkins with the Chief Counsel Award for her leadership and oversight of the Appellate Section.

Since returning to DLA, Diana has resumed representing public and privately held corporations, as well as partnerships, estates and individuals, in all aspects of tax disputes. She concentrates her practice on federal, state and local tax controversies, including criminal tax matters. Informed by her experience at the DOJ and her historical perspective, she regularly counsels clients on issues relating to judicial deference to IRS guidance, including regulations, as well as on the appeal process and the intersection of criminal and civil tax enforcement.

In 2020, Diana served as Chair of the IRS Advisory Council (IRSAC), which advises the IRS Commissioner on tax administration issues. Diana's IRSAC service, along with her roles in the leadership of the American Bar Association Tax Section and the American College of Tax Counsel (for which she currently serves as the 2nd Circuit Regent), facilitates her ability to provide up to the minute guidance to clients and to help improve tax administration for the benefit of taxpayers and the IRS.

Bar admissionsConnecticutDistrict of ColumbiaNew York
CourtsSupreme Court of the United StatesUnited States Tax CourtUnited States Court of Appeals for the Federal CircuitUnited States Court of Appeals for the Second CircuitUnited States Court of Federal ClaimsUnited States District Court for the Southern District of New YorkUnited States District Court for the Eastern District of New York

EXPERIENCE

Among the specific, highly skilled areas in which Diana has had substantial experience are the following:

  • Representing clients in connection with subpoenas issued by the Senate Permanent Subcommittee on Investigations;
  • Representing clients in connection with art related matters (including estate and gift tax, auction house guarantees, sales tax and alleged fraudulent transfers);
  • Representing accounting firms and accountants in matters involving their ethical obligations (including pursuant to Circular 230) and their obligations under federal and state tax laws (including relating to material advisor rules, preparer penalties and disclosure of taxpayer information); and
  • Assisting individual and institutional clients in becoming compliant with US tax laws (including with regard to undisclosed foreign financial accounts and assets).
Education
  • LL.M., New York University
  • J.D., Northeastern University
  • B.A., Amherst College, cum laude
    Charles Hamilton Houston Fellowship for Scholarship & Citizenship and John Woodruff Simpson Fellowship for the Study of Law

Awards

Chambers USA 

  • Band 1, Nationwide Tax: Private Client, High Net Worth (2024)
    "Diana Erbsen is simply the best. Her knowledge of the tax code is second-to-none and her ability to advocate for her clients is unrivalled”
    "Diana is a fantastic advisor."
  • Band 3, Nationwide Tax: Controversy (2021-2024) 
    "Diana is an excellent tax practitioner."
  • Band 4, Nationwide Tax: Controversy (2020) 

The Legal 500 United States 

  • Leading Lawyer, US Taxes: Contentious (2024)
    "Diana Erbsen is a superb writer."
  • Recommended, US Taxes: Contentious (2018-2023)
    "I have been working with Ellis Reemer and Diana Erbsen. Ellis' lifetime experience in contentious tax matters is invaluable in terms of developing strategy. Diana Erbsen's service with the Internal Revenue Service has provided an invaluable insight into certain policy considerations and procedural action." – Client, The Legal 500 2023
Additional Recognitions
  • Appointed to the ABA Tax Section's Appointments to the Tax Court Committee for a five-year term (2024-2029)
  • American College of Tax Council Board of Regents (2nd Circuit Regent)
  • Member of the Law360 Tax Authority Federal 2024 Editorial Board
  • Awarded Certification of Successful Completion of Mediation Skills Training by Quinnipiac University Law School’s Center on Dispute Resolution (April 2024)
  • J. Edgar Murdock Inn of Court, Member (2015-current)
  • Received IRS Chief Counsel Award for leadership and oversight in the Appellate Section of the Tax Division for the U.S. Department of Justice (January 2017)

REPRESENTATIVE PRESENTATIONS AND SEMINARS

  • Moderator, "Updates from the IRS Office of Chief Counsel and US Tax Court," 16th Annual Tax Controversy Forum, NYU School of Professional Studies (July 2024)
  • Panelist, "Making the Rules: How the Evolution of Legal Standards in Agency Rule-making Will Continue to Impact Treasury and the IRS," ABA Annual National Institute on Criminal Tax Fraud & Tax Controversy, Las Vegas (December 2023)
  • Panelist, "Updates from the IRS Office and US Tax Court," 15th Annual Tax Controversy Forum, New York University School of Professional Studies, New York (June 2023)
  • Panelist, "Analyzing transfer pricing cases and controversy strategies," International Tax Review (ITR) Annual Women in Tax Forum, New York (March 2023)
  • Panelist, "What Every Tax Litigator Needs to Know About the Appeal of Their Civil or Criminal Tax Case," ABA Annual National Institute on Criminal Tax Fraud & Tax Controversy, Las Vegas (December 2022)
  • Panelist, “Sensitive Audits: Ethical Considerations," ABA Annual National Institute on Criminal Tax Fraud & Tax Controversy, Las Vegas (December 2021)
  • Chair, "Internal Revenue Service Advisory Council (IRSAC) Virtual Public Meeting," (November 2020). 2020 Annual Report available here
  • Panelist, "Docketed vs. Undocketed Appeals? A look at the case from the perspective of IRS Counsel and Appeals," IRS Representation Conference, (November 2020)
  • Panelist, "Careers in Tax Law - Lunchtime Panel," American Bar Association, (July 2020)
  • Panelist, "Plenary: Voluntary Disclosures and Addressing the Sins of the Past: Ethical and Other Considerations" ABA Annual National Institute on Criminal Tax Fraud & Tax Controversy, Las Vegas (December 2019)
  • Panelist, "Important Developments in Administrative Practice," ABA Tax Section, San Francisco (October 2019)
  • Panelist, "Preserving Your Challenges Under the Administrative Procedures Act: More Important Now Than Ever," NYU School of Professional Studies Tax Controversy Forum, New York (June 2019)
  • Panelist, "Standards of Tax Practice All New Two-Minute Drills," ABA Section of Taxation, New Orleans (January 2019)
  • Panelist, "Litigating Whistleblower Cases in the Tax Court," ABA Section of Taxation, Atlanta (October 2018)
  • Interviewer, with Nina E. Olson (National Taxpayer Advocate), "Tax Compliance and Enforcement Update Part II - IRS Taxpayer Advocate Update" 10th Annual NYU Tax Controversy Forum, New York (June 2018)
  • Panelist, "Implications of IRS Non-acquiescence," ABA Section of Taxation, Washington, DC (May 2018)
  • Moderator, "Managing Tax-Related Whistleblowers, Leaks and Derivative Suits," International Tax Enforcement and Controversy Conference, Washington, DC (October 2017)
  • Panelist, "Recent Practice Changes at IRS Appeals," ABA Section of Taxation, Austin (September 2017)
  • Panelist, "Plenary Session: Women, Leadership & Law," Northeastern University School of Law Women in the Law Conference, Boston (May 2017)
  • Panelist, "Presidential Transition in the Treasury Department and DOJ Tax," Federal Bar Association Tax Law Conference, Washington, DC (March 2017)
  • Panelist, "Careers in Tax Law," Federal Bar Association, Washington, DC (March 2017)
  • Panelist, "Civil Enforcement Priorities," ABA National Institute on Criminal Tax Fraud & Tax Controversy, Las Vegas (December 2016)
  • Panelist, "Good News: Your Audit Is Over. Or Is It? The Process and Impact of a Joint Committee Review," ABA Section of Taxation, Boston (September 2016)
  • Panelist, "Current Developments, Court Practice & Procedure," ABA Section of Taxation, Boston (September 2016)
  • Speaker, with Deputy Solicitor General Malcolm Stewart, "Tax Appeals," IRS National Office CLE, Washington, DC (July 2016)
  • Panelist, "Tax Enforcement Updates," NYU Annual Tax Controversy Forum, New York (June 2016)
  • Speaker, Federal Bar Association's Women in Tax Law Luncheon Series, Washington, DC (June 2016)
  • Panelist, "Current Developments, Court Practice & Procedure," ABA Section of Taxation, Washington, DC (May 2016)
  • Speaker, "Current Civil and Criminal Enforcement Priorities," ABA Section of Taxation, Washington, DC (May 2016)
  • Panelist, "Current Developments, Court Practice & Procedure," ABA Section of Taxation, Los Angeles (January 2016)
  • Panelist, "Tax Careers in Government," ABA Section of Taxation, Los Angeles (January 2016)

Media Mentions

Prior Experience

  • Deputy Assistant Attorney General for Appellate and Review, Tax Division of the US Department of Justice
  • Attorney-Adviser, Hon. Robert Armen, Jr. US Tax Court

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