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 streams in the Upper Potomac by advocating for clean water and ensuring the the virtues of the Clean Water Act are enforced. Brent Walls has been an advocate for clean water for over a decade. With an Environmental Science background in fresh water ecology, Brent has brought a valuable scientific perspective to Potomac Riverkeeper since 2009. His experience in water quality sampling has ensured defensible enforcement actions and has been a unique advising asset with local watershed groups. Brent’s love of maps and proficiency with Geographical Information Systems has inspired the development of Water Trail maps in the Upper Potomac and has provided PRK with valuable interactive web maps and the creation of a mobile application to report water pollution.

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 the NC Wildlife Federation. After graduating from NC State University, with a self-created degree in Environmental Policy and Sustainable Development, he was hired as the first Upper Neuse Riverkeeper, serving from 2001 to 2008. He became the first Riverkeeper on the Yadkin River with Yadkin Riverkeeper, Inc. in 2008, also serving as Executive Director until 2014.

Dean has been awarded River Network’s 2009 National River Heroes Award. River Network’s River Heroes Award celebrates rivers and those who protect them by recognizing victories and honoring those who provide leadership and inspiration along the way. Yadkin Riverkeeper also won the 2011 North Carolina Wildlife Federation Governor’s Achievement Award Water Conservation Organization of the Year.

Most recently, he has been recognized by Waterkeepers Chesapeake as a recipient of their 2019 Waterkeeper Outstanding Win (WOW) Award for his fight against Dominion and accomplishments in making safe disposal of coal ash a requirement in Virginia.

Potomac Pollution Hotline: 202.871.8289

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 Riverkeeper position used to hard work and recognizing the importance of a hands-on approach to protecting our rivers. His passion for the water, combined with his people and analytical skills, honed over 25 years as a think tank senior policy analyst tackling some of the most vexing issues facing our nation, make him ideally suited to defend the Shenandoah against pollution, protect our right to clean water, and promote the recreational use of this beautiful river. Mark was the principal investigator and author of a government study that examined the ocean dumping of U.S. chemical weapons and explored the full-range of issues, challenges and potential solutions to this complex problem.

As the former president of the Potomac River Smallmouth Club, he successfully lobbied both Virginia and Maryland officials to implement and expand catch and release regulations and he was instrumental in getting the federal government to revise the Code of Federal Regulations to permit wade fishing on portions of the Potomac. Mark also served on the Board of Directors for the Mid-Atlantic Federation of Fly Fishers. He holds an M.A. from the George Washington University Elliott School of International Affairs.