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Roy W. Gillig


[email protected]



Roy’s practice encompasses federal, state, and international tax matters focusing on mergers and acquisitions, dispositions, joint ventures, financings, internal restructurings and reorganizations. 

He provides tax advice and counsel to strategic and private equity investors, as well as individuals, corporations, partnerships, nonprofits, and other entities.

Roy has provided tax services for substantial US and international transactions, including:

  • Separate sales of two medical diagnostic laboratories in S Corporation form for approximately $50 million each.
  • Tax due diligence and post-acquisition restructuring related to the $1.5 billion acquisition of a producer of industrial water treatment products and technology with operations in more than 20 countries.
  • $3 billion cash carve-out sale by a public company to a private equity investor of a business making equipment ancillary to semi-conductor manufacturing (2021).
  • $250 million cash sale by founders and a PE investor of an internet security consulting business to a non-US strategic buyer (2021).
  • $350 million cash sale of a multi-generational family business to a strategic buyer, requiring creative tax-driven solutions to address family goals, certain intransigent owners, and idiosyncratic structure (2021).
  • Representation of a private equity investor in its $50 million investment in a manufacturer of engineered construction equipment that included a 20% founder rollover (2020).
  • $2 billion sale of a 20% equity interest of a non-US biotechnology company to a U.S. biopharmaceutical company to form a strategic collaboration with respect to the development and sale of a cancer fighting compound (2019).
  • Representation of equity owners in $200 million cash-out sale to a PE investor of a 25% interest in an LLC conducting an international administrative services business (2019).

Over the course of his career, Roy has worked with publicly traded companies, private equity and hedge funds, family offices, business and commercial aviation companies, technology and other manufacturers, media and entertainment companies, software developers, Internet companies, foreign exchange brokers and stock brokers, international banks, S&Ls, hospitals and health care providers, colleges and universities, and charitable organizations.

He has been requested to speak at a number of industry events, including participation in a multiday symposium convened to help Harvard Law School make recommendations to the UN on the adoption of a revised model tax treaty, and “Arkansas Best coalition” efforts to advise and influence the IRS regarding development of tax rules for hedging transactions.

Prior to joining Mintz, Roy was a partner at another law firm in the Boston area. In addition, he served as director of international tax for a prominent corporation, and worked for a significant period of time in Big Four public accounting. He is also a Certified Public Accountant.



  • Syracuse University (JD)
  • Syracuse University (BS)

Recognition & Awards

  • Beta Gamma Sigma


  • Member, International Fiscal Association

Recent Insights

News & Press


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Read about recently issued IRS guidance related to the employee retention credit enacted in the Coronavirus Aid, Relief and Economic Security (“CARES”) Act.
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The CARES Act: A Summary Overview of Federal Tax Changes Affecting Businesses

April 1, 2020 | Alert | By Roy Gillig, David Salamon

This alert provides an overview of how the CARES Act, signed on March 27, 2020, eases tax burdens on businesses to increase their short-term liquidity as they deal with impacts of the COVID-19 pandemic.
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On December 22, 2017, H.R. 1, the Tax Cuts and Jobs Act (the “Tax Act”) was signed into law. As the first comprehensive U.S. federal income tax reform in over thirty years, the Tax Act includes dramatic changes to tax provisions applicable to businesses and their owners as well as individuals.
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On May 5, 2016, the IRS released new guidance regarding the renewable energy production tax credit (“PTC”) and energy investment tax credit (“ITC”) which most in the renewable energy industry will find favorable. 
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The “Protecting Americans from Tax Hikes” (PATH) Act was recently signed into law, and two provisions in particular benefit venture capital, private equity, and other investors owning or planning to purchase a corporation.
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News & Press

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Mintz advised Cardurion Pharmaceuticals, Inc., a biotechnology company developing novel therapeutics to treat heart failure and other cardiovascular diseases, in a private investment of up to $300 million from Bain Capital Life Sciences and Bain Capital Private Equity that will enable the Boston-based company to expand its drug discovery programs.
Mintz advised GPB Capital on its acquisition of a majority equity stake in Westwood, Massachusetts-based Prime Motor Group. The acquisition by Capstone Automotive Group, an affiliate of GPB, expands the group’s footprint throughout New England.
Mintz represents NuCana, which completed its approximately $114 million initial public offering. The United Kingdom-based clinical-stage company focuses on improving treatment outcomes for patients with cancer.
Mintz represented Right Networks in selling a controlling interest in the company to BV Investment Partners, a middle-market private equity firm focused on the business services and IT services sectors. 
Mintz lawyers represented Bio-Medical Devices, Inc. in the sale of a section of its manufacturing operations to Stryker Corporation, one of the world’s leading medical technology companies.