As director of TNC's Chesapeake Bay program, Mark coordinates our efforts across six states and Washington, D.C., focusing on both policy and conservation projects to improve water quality, support abundant fisheries and enhance and restore critical habitats in North America’s largest estuary.
Through Mark's leadership, the Bay program has contributed to the completion of the largest oyster restoration project in the world at Harris Creek, established alliances with agribusinesses to improve water quality and crop production, and worked to create a novel water management policy for the Susquehanna, the largest river on the east coast of the United States.
In May 2019, Mark was tapped to serve as Interim Director of the North America Agriculture program. In this role, Mark is overseeing TNC’s work with farmers, ranchers and many other partners to promote large-scale, science-based practices that safeguard our lands and waters while empowering growers to meet the rising global demand for food, fuel and fiber.
Mark's first position with TNC was a summer internship in 1994. Since then, he has held a number positions that have helped conserve nature all over the world and in his own backyard.
Mark holds a Master of Environmental Studies degree from Yale University's School of Forestry and Environmental Studies and a Bachelor of Science degree in Civil Engineering from Lehigh University.
Water Quality Benefits of Harris Creek Oyster Reef
A new study has estimated the water filtration and nutrient removal capacity of the restored Harris Creek oyster sanctuary reefs. Read more
Statement on Oyster Legislation
Thanks to the hard work of Maryland legislators, the 2019 session has plotted a path towards a more sustainable future for oysters and the Chesapeake Bay. Read more