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Joseph Sullivan

Associate

Washington +1 202 662 5130

  • About
  • Representative Matters
  • Credentials
  • About

    Joe Sullivan advises multinational clients on all aspects of federal tax controversy, including IRS audit preparation and defense, investigations, and administrative appeals. Joe also advises clients on inbound and outbound international tax planning, transfer pricing and intangible asset valuation, and on tax policy and legislative initiatives. Joe has been actively involved in the OECD’s Pillar Two project, and is a frequent speaker and panelist on that subject.

    Joe worked for three years in the Office of Tax Analysis at the U.S. Treasury Department prior to law school.

    Joe received his J.D., magna cum laude, from Harvard Law School. He received his M.S. from Johns Hopkins University and B.A., magna cum laude, from the University of Washington, where he was elected to Phi Beta Kappa.

    Areas of Expertise

  • Practices and Industries
  • Representative Matters
    • Lead tax advisor to international beverage company in day-to-day tax planning, audit preparation, and governance issues.
    • Advise multiple large multinational clients on active matters before the Internal Revenue Service, including representation before the IRS Independent Office of Appeals.
    • Represent leading technology company in ongoing R&D Tax Credit examination.
    • Advise shareholder group of major multinational company on tax planning, audit preparation, and legislative advocacy issues.
    • Represented leading technology company in connection with an IRS examination of significant transfer pricing matters.
    • Advised Fortune 50 advanced technology and manufacturing multinational on various issues relating to a multi-billion-dollar merger and its business unit separation transactions.
    • Drafted formal comment letter to the Department of Treasury on behalf of leading manufacturing company that resulted in a favorable change in the government’s regulatory position on a key tax reform item.
    • Represented low-income client in successful appeal of Medicaid benefit determination before the D.C. Office of Administrative Hearings.

    Areas of Expertise

  • Credentials
    Education
    • Harvard Law School, J.D., 2018
        • magna cum laude
    • Johns Hopkins University, M.S., 2015
    • University of Washington, B.A., 2011
        • magna cum laude
        • Phi Beta Kappa
    Bar Admissions
    • District of Columbia
    Memberships and Affiliations
    • International Bar Association Taxes Committee, Membership Officer, North America (2025-present)
    Previous Experience
    • U.S. Department of the Treasury (Office of Tax Analysis), Junior Stanley S. Surrey Fellow (2012-2015)

    Areas of Expertise

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