One team for one watershed.

A dedicated staff of water lovers serving six million residents of DC, Maryland, Virginia, and West Virginia.


Nancy Stoner


  Nancy Stoner is president of Potomac Riverkeeper Network.  One of the nation’s most experienced water policy experts, Nancy has a rich and distinguished background in protecting our nation’s water. Nancy… Read more

Phillip Musegaas


In his role as Vice President of Programs and Litigation, Phillip works with the Network’s Riverkeepers to develop and carry out their clean water advocacy and grassroots campaigns and… Read more

Emily Franc

(c) 202.579.6191

Emily Franc comes to Potomac Riverkeeper Network with extensive experience and background in environmental research, policy, fundraising and advocacy accumulated through years spent working on Capitol Hill for a… Read more

Morgan Bench

Morgan holds a B.A. from Washington College in Chestertown, MD, where she double majored in Environmental Studies & Studio Art. She joined Potomac Riverkeeper Network in 2020 as an… Read more
Mark Frondorf

Mark Frondorf


Mark joined Potomac Riverkeeper Network in 2015 as the official Shenandoah Riverkeeper. Having guided on the Shenandoah and Potomac for almost twenty years, Mark Frondorf comes to the Shenandoah… Read more
Alan Lehman

Alan Lehman

Alan Lehman is the Agricultural Project Manager for Shenandoah Riverkeeper, under Potomac Riverkeeper Network. Since 2009, Alan has been identifying and documenting farming practices that appear to be contributing… Read more

Mary Oshin

Mary Oshin has joined us as our much needed Grants and Database Administrator. A graduate of the University of Maryland Baltimore County with a double major in Media Communications… Read more

Serena Moncion

Serena is Potomac Riverkeeper Network’s Outreach Coordinator. She received her Bachelor’s degree in Environmental Science from the University of Virginia and was an aquatic ecology research assistant. As a… Read more

Dean Naujoks


Dean Naujoks joined Potomac Riverkeeper Network in 2015 as the Potomac Riverkeeper. Dean Naujoks has over 20 years of environmental non-profit experience. He began his non-profit career in 1991 with… Read more

Emily Silence

Emily joined Potomac Riverkeeper Network in 2018 as the Development Associate. She received her undergraduate degree in Political Science and Economics from American University, in Washington D.C. and her… Read more
Brent Walls

Brent Walls


Shortly after joining Potomac Riverkeeper, Inc. in 2009, Brent Walls now works as the Upper Potomac Riverkeeper and is responsible for defending the public trust of the rivers and… Read more