The Network is comprised of a two-person team based in Ellicott City, MD.

The Staff

Tom Schueler
Tom Schueler, Executive Director of CSN

Tom Schueler
Executive Director

Tom has more than 30 years experience in practical aspects of stormwater practices to protect and restore urban watersheds. He currently directs the Chesapeake Stormwater Network, a non-profit organization devoted to implementation of more sustainable stormwater practices across the Chesapeake Bay watershed. Tom directs the Chesapeake Bay Stormwater Training Partnership, which provides webcasts, workshops and on-line training modules to train engineers on new practices. Tom also serves as the stormwater technical coordinator for the EPA Chesapeake Bay Program. Tom also is active in promoting better stormwater regulations and permits in communities across the Bay. Tom founded the Center for Watershed Protection in 1992, and loves stream-walks, good scotch, and bad dogs. To contact Tom about all things stormwater send an email to:

David Wood, Stormwater Coordinator

David Wood
Stormwater Coordinator

David manages CSN’s annual webcast series and training workshops, and helps develop stormwater resources to support CSN’s 11,000+ member network.  Prior to joining CSN, David worked for the Chesapeake Research Consortium at the EPA’s Chesapeake Bay Program Office. While at the Bay Program Office, he supported programs to help states track, report, inspect and verify best management practices to meet the Chesapeake Bay TMDL.  David has his BA in Biology from St. Mary’s College of Maryland and lives in Annapolis. When he is not in the office, you can probably find David out on a hike or in the stands at Camden Yards. You can reach David any time at

Board of Directors

The Network now has a distinguished board of directors to guide its growth and strategic direction, drawn from many disciplines and many different parts of the Bay.

Jennifer Zielinski
Jennifer Zielinski, President of CSN Board and Engineer at BioHabitats.

Jennifer Zielinski serves as the President of the Board for CSN. A water resources engineer with Biohabitats, Jennifer has over 14 years of experience in watershed and stormwater planning and policy development. She has worked with communities throughout the country on projects focusing on stormwater design and retrofitting, local stormwater and watershed program guidance, watershed planning, upland area pollution prevention assessments, better site design, and other watershed consulting areas. Before joining Biohabitats, Jennifer was program director at the Center for Watershed Protection (CWP), a nationally recognized non-profit that develops innovative technical guidance relating to watershed assessment and management, stormwater management, NPDES regulatory compliance, and natural resource conservation.

Bill Stack, Deputy Director of Programs, Center for Watershed Protection

Bill Stack is The Deputy Director of Programs with the Center for Watershed Protection where he has worked in that position for 8 years.  He has over 40 years of experience  in water resource protection and restoration programs related to water supply and source water protection, urban stormwater management, agricultural non-point source control, and flood management. Prior to coming to work for the Center Bill spent 30 years working for Baltimore City Department of Public works where he headed the Source Water Protection and MS4 Programs. Bill has a B.S in Biology from St. Mary’s College of MD and M.S. in Biology from Towson University and is a Professional Engineer.

Dr. Shirley Clark
Dr. Shirley Clark, Assistant Professor of Environmental Engineering at Penn State – Harrisburg

Dr. Shirley Clark currently is an Assistant Professor of Environmental Engineering at PennState– Harrisburg (PSH). She regularly teaches courses in hydrology, conveyance system design, open-channel hydraulics, erosion control and risk assessment at both the graduate and undergraduate level.  Shirley’s bachelors’ degree is in Chemical Engineering fromWashingtonUniversityand her doctoral degree is in Environmental Health Engineering from UAB. She has worked in the environmental field since 1987 and in water resources and stormwater since 1992. She is a registered professional engineer in the state ofAlabamaand is a Diplomat in theAmericanAcademyof Water Resources Engineers. She is a member of several professional organizations (WEF, AWRA, ASCE/EWRI, and AEESP) and serves on a variety (too many!) of stormwater-related committees.

Scott Crafton
Scott Crafton, Stormwater Project Manager for the Louis Berger Group

Scott Crafton, a Virginia Tech graduate and registered Landscape Architect in Virginia, retired in June 2006 as Assistant Director of the Virginia Department of Conservation and Recreation (DCR), after 30 years of state service largely related to stormwater management regulatory programs. Scott was also formerly Executive Director of the Virginia Chesapeake Bay Local Assistance Department and chairman of the EPA Chesapeake Bay Program’s Stormwater Work Group. Since retirement, Scott has worked part-time on projects for DCR and, subsequently, Virginia DEQ to assist with revisions of the Virginia SWM Regulations, to revise the Virginia SWM Handbook, and to establish a web-based Virginia Stormwater BMP Clearinghouse. Recently Scott was hired as a stormwater project manager for the Louis Berger Group, and currently he is contracted to the Virginia Department of Transportation helping them with MS4 permit compliance.

Dave Hirschman, Hirschman Water and Environment, LLC

David Hirschman manages Hirschman Water & Environment, LLC, a consulting firm located in Charlottesville, VA, specializing in water resources planning and management. He has thirty-five years of experience with stormwater and water resources management in the public, private, academic, and non-profit sectors. Hirschman has worked across the country, developing stormwater and green infrastructure design manuals and specifications, designing green infrastructure projects, developing natural resources master plans, and orchestrating numerous trainings and workshops

Mary Gattis
Mary Gattis, Mary Gattis, LLC

Mary Gattis serves as the Vice President for CSN. Mary has worked on environmental issues in the public, private and non-profit sectors for the last 30 years. Most recently she worked within the Chesapeake Bay Program partnership as Coordinator of the Local Government Advisory Committee to the Chesapeake Executive Council (LGAC). In her capacity as LGAC Coordinator, Mary interacted with local governments throughout the 64,000 square mile Chesapeake Bay watershed. She served on several CBP Goal Implementation Teams and workgroups where she advocated for policies and programs impacting local governments’ participation in watershed protection and restoration. Mary previously served as senior environmental planner at the Lancaster County Planning Commission (Lancaster, PA) where she oversaw the development of the County’s first Integrated Water Resources Plan. She has extensive experience in Watershed Implementation Planning, Brownfields redevelopment, pollution prevention and solid waste management. She is currently working as an independent consultant in the areas of local engagement and environmental policy.

Jim Caldwell, Director, Howard County Office of Community Sustainability

Jim Caldwell serves as the Treasurer for CSN. Jim has spent his career as a local government environmental manager in the Baltimore, Washington region. Jim was appointed the Director of the Howard County Office of Community Sustainability in December of 2014. Guided by principles of science, ingenuity, sustainability and stewardship, the Office engages in water quality, economic development, agriculture, energy and education initiatives.    Jim worked for Montgomery County Maryland for 25 years, and for 12 years he served as Director of the Department of Environmental Protection, overseeing natural resource protection programs for water, air, energy, and pollution prevention. His long dedication to environmental protection is grounded in training in wildlife zoology from Ohio State University and a MS in Environmental Management from American University.   Jim is a member of the Board of the Maryland Water Monitoring Council, and is also a member and past chairman of the Maryland Science Center’s, Science Advisory Council.