Jennifer Breen represents domestic and multinational businesses, large partnerships, high-net-worth individuals, and family offices on tax controversy and Internal Revenue Service (IRS) administrative matters. She also counsels professional services firms, investment fund managers, and private equity firms on partnership tax issues. With decades of experience spanning government service, a “Big Four” public accounting firm, and in-house as the director of tax controversy for a large multinational corporation, Jennifer offers a rare perspective in her invaluable ability to see tax issues from multiple vantage points.
Partner Jennifer Breen interviewed author Cal Newport on how Morgan Lewis can adopt some of the principles set out in his latest book, “Digital Minimalism.” Cal shared with the Washington office how digital minimalism does not mean banishing technology, but rather optimizing it in a way that helps you achieve what is most important to you.
Jennifer’s proven skills and extensive background includes all aspects of tax controversy and litigation, including managing IRS audits, filing and presenting protests in IRS Appeals, and ultimately litigating cases before the United States Tax Court and other federal courts. Her understanding of various stakeholders’ needs enables Jennifer to craft nuanced strategies and makes her an empathetic advisor and effective advocate.
Drawing on her experience as an attorney with the IRS Office of Chief Counsel’s National Office, Jennifer marries substantive tax knowledge with strong relationships at the IRS and firsthand insights into navigating issues, seeking guidance, and understanding administrative processes and federal rulemaking at this agency. She seeks to resolve issues at the earliest stage possible, utilizing procedural techniques including pre-filing agreements, private letter ruling requests, requests for technical advice, and other informal methods. Jennifer also routinely advises clients on filing and compliance matters, voluntary disclosures, interest issues, penalty abatement actions, IRS requests and summonses, enforcement proceedings, and joint defense agreements.
Prior to joining Morgan Lewis, she distinguished herself as a trusted in-house advisor for Mattel, an American multinational toy manufacturing and entertainment company. In this capacity, Jennifer gained a keen understanding from an in-house perspective of all aspects of tax compliance and controversy. She was responsible for all matters involving US federal income tax and foreign tax controversies as well as those involving state and local corporate and business tax, sales and use tax, and escheat and unclaimed property audits. In addition, she managed the company’s global reportable transaction compliance and compliance under the Foreign Account Tax Compliance Act.
While with PwC, Jennifer represented major corporations, partnerships, S corporations, and individuals in resolving domestic and international controversy issues, counseled clients on risk management matters, and routinely advised on filing and compliance issues as well as other issues arising with accounting, audit, and internal controls.
As a director of the Washington D.C. Center for Public Interest Tax Law, a nonprofit tax clinic providing pro bono legal services to taxpayers across the United States, Jennifer oversees clinic operations including regular attendance at United States Tax Court calendar calls and the delivery of pro bono legal representation to low-income taxpayers.
Highly Regarded, Tax Controversy, District of Columbia, International Tax Review's World Tax Guide (2025)
Ranked, Tax: Private Client, High Net Worth Guide, Nationwide, Chambers USA (2024)
Ranked, Tax, District of Columbia, Chambers USA (2022–2024)
Up-and-Coming, Tax, District of Columbia, Chambers USA (2020, 2021)
Recommended, Tax: US taxes: contentious, The Legal 500 US (2019, 2020)
Listed, The Best Lawyers in America, Tax Law, Washington, DC (2022–2025)
Emerging Women Leaders in Private Practice, DCA Live (2019)
Member, Practice Group of the Year, Tax, Law360 (2017)
Recommended, The Legal 500 US (2016)
Fellow, American College of Tax Counsel
Member, J. Edgar Murdock Inn of Court
Council Director, Section of Taxation, American Bar Association
Chair, Administrative Practice, Section of Taxation, American Bar Association (2017–2018)
Best Lawyers, Tax, Washingtonian Magazine (2020)
IRS Special Act Award (2002–2005)
Director and Treasurer, Washington DC Center for Public Interest Tax Law