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Sullivan & Worcester LLP

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Joseph Darby

Work (617) 338-2985
Sullivan & Worcester LLP

Work Department



Joseph B. Darby III is a partner in Sullivan & Worcester's Boston office, focusing his practice on business and transactional tax law. Mr. Darby advises a wide variety of corporations and high-net-worth individuals on tax and legal aspects of business and real estate activities and represents these taxpayers before federal and state taxing authorities. He also works with high-net-worth individuals and business owners to organize their personal income tax and estate planning affairs in order to maximize wealth preservation and minimize tax on transfers to family members, charities and other recipients. This is accomplished through the use of the latest sophisticated estate planning strategies, including family limited partnerships, installment sales to defective grantor trusts, the formation of family charitable foundations, and other similar techniques. Mr. Darby has represented and advised numerous public and private companies, as well as private equity and venture capital firms, on investment and acquisition transactions and on the disposition of business interests, in transactions ranging from early-stage investments in high-tech startups to acquisitions and sales of mature, late-stage companies and publicly traded corporations. Another focus in Mr. Darby’s practice is the taxation of intellectual property, including tax aspects related to the development, licensing and exploitation of intellectual property rights, the migration of valuable intellectual property to offshore jurisdictions and the tax-efficient sale of intellectual property rights.


Member of the Massachusetts Bar and the U.S. Tax Court


Founder and President, Watertown Police Foundation (2013 to present)
Former President and Member of the Board of Trustees, Boston Police Foundation (2008-2012)
Member, Board of Assessors, Watertown, Massachusetts (1993-2011)
Adjunct Professor, Boston University School of Law, Graduate Tax Program (2003 to present)
Adjunct Professor, Masters in Taxation Program, Bentley University (2007 to present)
Member of the Advisory Board of World Trade Executive for the following publications: Practical US/International Tax Strategies, Practical European Tax Strategies and Practical US/Domestic Tax Strategies


J.D., cum laude, Harvard Law School, 1978; B.S., magna cum laude, with Department of Honors in Mathematics, University of Illinois at Urbana-Champaign, 1974

United States: Tax

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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