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I have practiced environmental law for over 30 years. While my practice is mainly focused in Massachusetts, because I have clients with operations located out of state, involving federal law, such as superfund and RCRA, I advise clients on these matters throughout the United States. My work has ranged from negotiating a biomass feedstock agreement for a project in Hawaii, to negotiating superfund settlements for sites located in Louisiana and clean up contracts for sites located in New Jersey and throughout the US. I like to think that my clients are solving environmental problems. Because they are at the interface between environmental problems, the public and business, they face a wide array of issues. My job is to help to navigate that maze in a cost effective, thoughtful and responsible manner. The end result is to produce results for today's businesses and tomorrow's environment. The breadth and depth of my experience is demonstrated by the environmental due diligence I performed on the acquisition by my client of over 50 hazardous waste facilities located in thirty states, resulting in my client becoming the largest hazardous waste company in North America. Most recently my practice has focused on development of renewable energy facilities, ranging for solar projects on landfills to utility scale biomass facilities. I have been very involved with the proposed regulatory changes for the development of anaroebic digestion facilities in the Commonwealth of Massachusetts. I hope to continue to participate in the development of domestic renewable, cleaner energy resources to reduce dependence on foreign oil. In addition, I continue to represent a wide array of clients on superfund, c. 21E, RCRA, solid waste, recycling, environmental review, zoning, clean up contracting and related issues.
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Chat withState: New York
Acquired: 1982
No misconduct found
State: Massachusetts
Acquired: 1981
No misconduct found
Suite 1118, 20 Park Plaza, Boston, MA, 02116-2912
1 Client Review
Showing 1 - 1 of 1 review | Practice Area Knowledge
Posted by Hannah | January 21, 2026 | Real Estate
Kind, Responsive, and Professional
I spoke with Thomas Mackie in late December regarding a complex condominium matter. Although he was unable to formally represent me, he was generous with his time, thoughtful in his guidance, and went out of his way to try to connect me with appropriate legal resources. A month later, he still follow...
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2015
Recognized, Best Lawyers in America
2015
Recognized, Who's Who Legal: USA “ Environment"
2015
Recognized, Top Environmental Lawyer, Chambers USA
2000 - Present
Volunteer Mediator, Massachusetts Department Of Environmental Protection
1985 - Present
Managing Shareholder and President, Mackie Shea, P.C.
1983 - 1985
Attorney and Assistant Secretary, Morse Shoe, Inc.
1981 - 1983
Attorney and Assistant Secretary, Bangor Punta Corporation
1999 - Present
Environmental Business Council of New EnglandVice Chair
1981 - Present
Boston Bar Association
Won on all counts
Won on all counts
Won on all counts.
1981
JD - Juris Doctor Cum Laude
1977
BS
N/A
Program on Negotiation
N/A
Course on Alternative Dispute Resolution
N/A
Courses on Negotiation
2014
2013
2013
2012
2010
2014
2013
2012
2010
2008
English