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Sullivan & Worcester LLP

Work +1 617 338 2800
Fax +1 617 338 2880

Daniel Ryan

Work (617) 338-2457
Sullivan & Worcester LLP

Work Department



Daniel P. Ryan is a partner in the Tax Department of our Boston office. His practice focuses on representing taxpayers in federal and state tax litigation and controversies as well as transactional planning involving corporate, franchise, personal income and sales/use tax matters. Prior to his employment at Sullivan & Worcester, Dan was an attorney at the Internal Revenue Service Office of Chief Counsel, where he represented the Internal Revenue Service in litigation before the United States Tax Court and served as a Special Assistant United States Attorney for the District of Massachusetts.


Massachusetts, 2002
New York, 2002
U.S. District Court, District of Massachusetts
U.S. Tax Court


Boston Bar Association, Tax Section
American Bar Association, Tax Section


LL.M., Taxation, Boston University School of Law, 2003
J.D., magna cum laude, Catholic University, Columbus School of Law, 2001
B.A., Boston College, 199

United States: Tax

US taxes: contentious

Within: US taxes: contentious

Sullivan & Worcester LLP represents companies and individuals in state and local tax matters against the IRS, with a particular focus on Massachusetts. The practice handles tax controversies at all stages, including ruling requests, audits, administrative appeals, and trial and appellate litigation. Daniel Ryan and practice lead David Nagle represented Delta Dental, a large dental insurance business with 74 million customers, in litigation seeking a multimillion-dollar refund of insurance premium excise tax from the Massachusetts Department of Revenue. Other key names include counsels Joseph Donovan and Judith Edington, Richard Jones and associate Caroline Kupiec, who joined in November 2018 from KPMG. All lawyers named are located in Boston.

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US taxes: non-contentious

Within: US taxes: non-contentious

Sullivan & Worcester LLP‚Äôs Boston based tax attorneys are ‚Äėvery responsive, knowledgeable and always up-to-date with the latest tax developments‚Äô. The team has a strong focus on REIT mandates, but also advises on estate planning, and domestic and international M&A transactions. Ameek Ashok Ponda¬†acted for Government Properties Income Trust in its merger with Select Income REIT, and is also advising Zayo Group Holdings on its ongoing exploration of conversion to a REIT. Joseph Darby, David Nagle¬†and Christopher Curtis¬†have considerable experience in transactional tax matters, tax planning for corporations and private individuals, and advocacy before federal and state tax authorities. Further, the team assisted American Tower Corporation, Equinix, Iron Mountain and several other large public REITs on REIT conversions, related tax structuring and financing matters.¬†Brian Hammell¬†and Daniel Ryan¬†were promoted to partner in January 2018. Steven Eichel¬†departed to Saul Ewing¬†in May 2018.

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