Sean Mahoney

Executive Vice President and Director, CLF Maine CLF Maine @seanclf

Sean Mahoney serves as the Executive Vice President and Director of CLF’s Maine Advocacy Center. Prior to joining CLF in 2007, Sean practiced environmental law in San Francisco and Portland, ME for 15 years, where he represented a variety of commercial and non-governmental entities in all aspects of state and federal environmental litigation and permitting.

At CLF, Mahoney focuses on marine conservation and sustainability, climate change, transportation and energy infrastructure, and restoring and protecting Maine’s rivers and coastal watersheds.

Mahoney, a resident of Falmouth, received his J.D. from the University of Virginia School of Law and his undergraduate degree from Bowdoin College. He was a Judicial Law Clerk for the Honorable Fred I. Parker, U.S. District Court for the District of Vermont and served as a Peace Corps volunteer in Sri Lanka. Mahoney has been recognized as a leading lawyer in his field by a number of organizations, including the respected legal research and publishing firm, Chamber & Partners. He has served on a number of boards, including GrowSmart Maine (chair), Gulf of Maine Research Insitute, Konbit Sante and the Falmouth Land Trust, and currently serves as a Town Councilor in Falmouth.

Recent Posts

Maine Makes Plan to Manage Polluted Stormwater Runoff
A decade ago, South Portland’s Long Creek teetered on the edge of crisis, so polluted that it could barely sustain wildlife. Surrounded by big box stores, parking lots, and office buildings of the ever-expanding Maine Mall area, the meandering creek had been cowed by stormwater pollution. When rain fell or snow melted, it would rush…
Putting Maine’s New Climate Law into Action
With newly elected Governor Mills at the helm, Maine passed emergency legislation last June that requires the state to drastically reduce its climate-damaging emissions. This new climate law sets enforceable emissions targets and establishes a roadmap to get there. And now the rubber is hitting the road. Two utilities are looking for approval to pass…
Maine’s Presumpscot River Runs Free
In a milestone for the health of the Presumpscot River and Casco Bay, crews removed the dam at Saccarappa Falls over the summer.  For the first time in more than two centuries, the waters of the Presumpscot flowed freely over the falls through the heart of Westbrook. The removal of the dam structures themselves will…
A Grand Finale for Coal-Fired Power in Massachusetts
A few minutes ago, I witnessed history when Brayton Point Station’s massive cooling towers were reduced to heaps of rubble. These towers loomed over Mount Hope Bay and the town of Somerset for years. Their implosion marks the end of coal in Massachusetts and signals our region’s commitment to a clean energy future.   ICYMI:…
Clean Energy Connect Project Will Benefit Mainers While Cutting Carbon Pollution
Central Maine Power’s Clean Energy Connect project will build a 145-mile transmission line through Maine to connect more than 1,000 megawatts of Canadian hydropower to New England’s electrical grid. By bringing more clean energy to the region, the project will reduce our reliance on dangerous, expensive fracked gas and significantly cut climate-damaging emissions. CLF, working…


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