Sean Mahoney

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

Sean Mahoney serves as the Executive Vice President, Director of Programs 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

A Fish or a Plant? Rockweed Identity the Central Question in Maine Court Case
When you walk around the shores of Downeast Maine at low tide, you’re sure to see rockweed covering much of the coastline. This critical habitat for shellfish, seabirds, lobsters, and crabs is a vital piece of Maine’s ecosystem – but is it really a plant, or rather, is it a fish? This is the central…
One Year Down: Fighting Back and Fighting On for New England
We’re not giving in. Yes, approaching a year after President’s Trump’s election, he seems intent on undermining decades of work to protect public health and the environment and fostering an ideology that denies and denigrates the basic facts of science. But we’ve been here before. In the 1970s, oil companies were intent on drilling for…
Who Owns Downeast Maine’s Seaweed? 
If you’ve spent any time along the Downeast Maine coast, then you’ve encountered rockweed. The green-brown seaweed known officially as Ascophyllum nodosum is ubiquitous here. At low tide, it carpets the rocky coastline and provides a refuge from the heat or the cold for a variety of shellfish and crustaceans, including juvenile lobsters, crabs, mussels,…
The Fight for Solar in Maine Continues
In a stunning walk backwards, the Maine legislature failed again to override Governor LePage’s veto of legislation that would have supported solar progress in Maine. Passed in June, the bipartisan bill would have helped create stability in the state’s solar marketplace by ensuring that solar panel customers are fairly compensated for the power they produce…
Restoration Efforts Bring Thousands of Native Fish Back to Maine’s Coastal Rivers
It’s that time of year when fish like alewives and blueback herring journey from the sea to their native fresh waters to spawn. As a keystone species, these fish, collectively known as river herring, play a critical role as building blocks in our coastal ecosystems. They are also important to the health of New England’s fisheries,…


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