Sheehan is a US-based public interest environmental lawyer with an interest in empowering and supporting communities in taking action to make the world a better place. She serves as the coordinator of the North American Megadam Resistance Alliance.

She served as an Assistant Attorney General for the Commonwealth of Massachusetts and as a Staff Attorney at the Massachusetts Water Resources Authority. She holds a B.A. in Economics from Colgate University and J.D. from Boston College Law School.

She specializes in litigation in state and administrative law litigation in the areas of clean water, forests, climate and land protection. She co-founded several grassroots campaigns for the protection for rivers and land and has served on various boards including Earthrise Law Center-Advisory Board, Northeast Wilderness Trust, Wildlands Trust of Southeastern Massachusetts, Jones River Watershed Association and The Nature Conservancy/Massachusetts Chapter. Awards for her work include the Jones River “River Rat,” Cape Cod Bay “Lifesaver”, Briggs Leadership Award from the Wildlands Trust and John O’Connor Grassroots Leadership Award from Clean Water Action.
She enjoys hiking, competitive rowing and knitting.