Board of Directors

Jim Martin, Land Preservation Committee Chair
Jim Martin, Board President
Director of Research and Development at McCormick and Company, Inc., Jim has worked to drive positive environmental change and encourage social responsibility as both a member of the Corporate Sustainability Team and Chair of the Technical Innovation Center Team. He enjoys running, biking, and hiking in the beautiful northern Baltimore County landscape he calls home and feels deeply committed to protecting and preserving the Gunpowder Valley watershed for future generations.
Cyrus Green, Vice President
Cyrus Green is a lead manager at T. Rowe Price and joined the GVC board in 2019. He holds a B.S. in Engineering Physics from Morgan State University, a M.S. in Optical Engineering from Norfolk State University, and M.B.A. from The Carey School of Business, Johns Hopkins University. A resident of Baltimore, he spends his time outdoors camping, sailing, and hiking with his friends and family. He appreciates the importance of preserving the natural landscape of Gunpowder Valley and is attracted by organization’s goals and enthusiasm towards its cause.
Charlie Conklin, President
Charlie Conklin, Vice President of Outreach
Retired Bethlehem Steel Corporate Manager. Gunpowder Valley Conservancy member since 1990. Current Board Supervisor of the Baltimore County Soil Conservation District. Active in church missions for restoring creation. Enjoys being in nature and working with various local and state boards and committees to help preserve and restore our natural inheritance and agricultural resources. Believes the world is enriched when we plant trees so that those who come after us can watch them grow.
Brandi Overstreet, Secretary
Brandi is a lead manager with T. Rowe Price and joined the GVC board in 2016. She studied Biology at the University of Utah and holds both B.S and M.S. degrees in Finance from Penn State and Loyola University, respectively. A 10-year resident of Baltimore, she spends her time outdoors cycling, sailing, and hiking with her Aussie sidekick, Maisie. She also enjoys writing and playing music. Having grown up in St. Mary’s County, she has a passion for the Chesapeake Bay and believes in the importance of preserving its surrounding environment.
Edward W. Stuebing, Ph.D. Treasurer, Founder and Past President
Edward W. Stuebing, Ph.D. Treasurer, Founder and Past President
Retired Physical Sciences and Life Sciences Research Program Manager for Joint Services Chemical and Biological Defense, Aberdeen Proving Ground. Founded the Gunpowder Valley Conservancy in 1989 and served five years as the first President. Treasurer ever since. In retirement, Ed enjoys playing trombone in a jazz big band and a symphonic concert band, and doing his best to keep up with the wonderful people who are the living, breathing, working, and playing Gunpowder Valley Conservancy.


Don Callihan
Don Callihan is a clinical microbiologist and retired Staff Scientist from BD Diagnostics in Sparks, MD. Since retirement he has become a Maryland Master Naturalist and joined the GVC board (2019). He serves on the Baltimore Area Council, BSA, Conservation Committee in various capacities teaching conservation and ecology to Scouting youth and adults and is the Council Outdoor Ethics Advocate. Don is an active member of the Maryland Invasive Species Council and of the Lake Roland Nature Council’s Environmental and Historic Preservation Committee. Don lives in Cockeysville above the Loch Raven Reservoir and is committed to the health of the forest in watersheds feeding this important regional source of drinking water for Baltimore City and County as well as its significant recreation potential.
Kathleen Crostic
Kathleen Crostic is the Partnerships Manager at Towson University, where she also obtained her B.S. in Family Studies and Community Development. In her role, she matches needs and expertise of TU faculty, staff, students, and community partners and explores collaborative opportunities to further the mission of non-profits while providing experiential opportunities to students. Kathleen is passionate about environmental preservation and conservation and enjoys hiking the many trails throughout the region, camping, kayaking, and gardening. Kathleen began her work with GVC as a volunteer Crew Chief and Stream Captain, but is excited to join the board to deepen her positive impact on the environment, our watershed, and on future generations.
Stephanie Gordon
Stephanie Gordon is a Systems Engineer at Northrop Grumman Corporation and a transplant to the Baltimore area from Pittsburgh, PA. She joined the board in 2017 after receiving her Masters of Science from Johns Hopkins University, and her undergraduate Electrical Engineering degree from Lehigh University. Stephanie is an avid indoor gardener, and a hiking, biking, and kayaking enthusiast. As a resident of Baltimore City, she recognizes the importance of the natural resources of the Bay and surrounding watershed regions.
Sarah Haines
Sarah Haines taught science at Pocomoke Middle School before moving across the bay to take a position at Towson University, where she has been teaching for 20 years. She earned a bachelor’s degree in biology from Bucknell University, an M.S. and PhD in Zoology from the University of Georgia, and an M.A. in Education from Salisbury University. Sarah’s involvement in science education and environmental education initiatives has led her to hold several positions of leadership at the national level, most notably with the Environmental Protection Agency’s National Environmental Education Advisory Council (NEEAC). Sarah was a founding member of the Maryland Association for Environmental & Outdoor Education's (MAEOE) Environmental Education Certification Committee. Sarah's passion for educating others about the environment led her to join the GVC board in 2020.
Luke Hancock
Luke Hancock is a Senior Corporate Social Responsibility Specialist at Baltimore Gas and Electric Company (BGE). He is the Events Co-Chair with the Exelon EcoTeam. Luke holds a B.S. in Marketing and Business and Professional Writing from Salisbury University. A resident of Harford County, he spends most of his time outdoors hiking, running, traveling, and going to the beach with his friends and family. He joined the GVC board in 2020.
Jonathan Lovell
Jonathan Lovell is a CPA with Gross, Mendelsohn and Associates. He received his undergraduate degree in accounting and an MBA in management, both from Loyola University Maryland. He grew up on a small farm in Frederick County, Maryland but has been a Baltimore area resident for the past 20 years. He enjoys trail-running, biking, and fishing with his family throughout the Gunpowder watershed and wants to help keep it clean and healthy for them and future generations.
John Miller,
John Miller
Trained as an industrial designer, John worked as an architect, house builder, custom woodworker, and wooden boat builder before moving to Maryland to retire. He has been a member of the Gunpowder Valley Conservancy for over a decade and served as Board Secretary for much of that time. With nine rain barrels on his own property, John is an ardent proponent of sustainable living and watershed preservation who loves hiking with his wife along the upper Gunpowder.
Nancy Pentz
Nancy is a retired Natural Resource Specialist from Baltimore County government where she most recently directed the development of watershed plans. She is a geographer, with an undergraduate degree from Bucknell University and a Master’s degree from the University of Iowa. She has been a long-standing supporter of the GVC and on the Membership Committee for seven years. She is a fervent water conservationist, loves walks in the woods, and preserving our natural resources, landscapes and history.
William (Bill) Rees
Bill is a retired Senior Business Analyst from the Baltimore Gas and Electric Company (BGE) and was in various leadership positions in the BGE Vegetation Management Unit during his 36 year BGE career. Bill is originally from southeast Pennsylvania and has a degree in Forest Science from Penn State. He is an outdoor enthusiast and enjoys traveling. Bill currently does part-time consulting and continues to be involved in industry standards development In his spare time he enjoys volunteering to plant trees in Catonsville where he lives and furthering the mission of protecting the environmentally significant Gunpowder River watershed. Bill has been with the Gunpowder Valley Conservancy since 2016.
Deborah Slawson
Deborah Slawson is a semi-retired Fluvial Geomorphologist most recently working with the French National Research Institute of Science and Technology for Environment and Agriculture in Antony, France, specializing in dam removals and stream channel restoration. Previously she worked with several environmental engineering firms in the mid-Atlantic area. She received a Ph.D. from Pennsylvania State University in landscape ecology and a Masters degree from Johns Hopkins University in environmental engineering. Historically, she has served on the Pennsylvania Department of Environmental Protection (PADEP) Legacy Sediment Workgroup, the Maryland Stream Restoration Association Program Committee, the Canaan Valley Institute (Mid-Atlantic Stream Restoration Conference Science Steering Committee), the Virginia Stream Alliance, and the Keystone Stream Team in Pennsylvania. Since retirement she has become a mediator with the Mediation Services of Adams County (PA) and is pursuing landscape art studies in stained glass and copper plate intaglio printmaking. She became interested in the Gunpowder watershed while doing her doctoral dissertation field work on old dam sites in the Upper Gunpowder Falls and canoeing most of the Gunpowder.
Olivia Zug
Olivia Zug is a higher education professional with varied experience including admissions, student development, communications and outreach, social responsibility, and career services. She is currently the Assistant Director for Career Connections at Loyola University Maryland, where she advises students on their career development and builds relationships with employers. She studied Government and Politics at the University of Maryland College Park and is currently pursuing a Master's of Education in School Counseling at Loyola University. She pursues her passion for holistic health by teaching group fitness classes at The Y and Brick Bodies. She loves camping, hiking, biking, food, and traveling. As a Baltimorean and lifelong environmentalist, she is thrilled to have the opportunity to support sustainability initiatives through the GVC.

Advisory Council

Randy Davis
Randy Davis previously served on the Board of the Gunpowder Valley Conservancy. He serves as the Controller for Catholic Charities of Baltimore, Maryland’s leading provider of human services to individuals and families of all faiths, ages and ethnicities. Randy has lived near the Gunpowder watershed all his life and is a graduate of Calvert Hall High School and Loyola University Maryland. He is also a Certified Public Accountant and Eagle Scout. In his spare time, Randy enjoys sailing on Middle River, golfing, biking, and spending time with his family. He is passionate about environmental issues and helping the Gunpowder Valley Conservancy achieve its mission.
Justin Esworthy
Justin is a partner of the private law firm Timmerman, Beaulieu, Hinkle & Esworthy, LLC based in Towson. When not involved in the litigation process, Justin enjoys spending time outdoors including hiking with his wife and two young sons. Justin and his family are currently building a home on their property that is in a conservation easement in White Hall, which encompasses a portion of the NCR Trail and Little Gunpowder Falls. Justin is committed to sustainable living and preserving natural resources. He became active with the Gunpowder Valley Conservancy in 2016.
Purnell Glenn
In 2016, Purnell received the Gunpowder Valley Conservancy's Community Leader of the Year award for significant achievements including but not limited to - coordinating and leading numerous community workshops (tree planting, rain barrel and more), contributing hundreds of hours of volunteer service, leading the effort to Bay Wise certify the Miramar Landing community (the first of its kind in Baltimore County,) and being a member of the GVC Clear Creeks Steering Committee. Purnell is also the President of Miramar Landing HOA, represents his community at the Essex Middle River Civic Council, volunteers for Young Life, and is a big brother to kids in need. He has been the owner of a small computer company since 1987. He grew up fishing on the bay which contributed to his love of the outdoors.
Dorothy Hinnant
Dorothy, retired from Sparrows point after 15 years, is now an active minister. She is very active in her Bowerman Loreley Beach community as Vice President of the Community Association. Additionally, she is President of Greater White Marsh County Council and a Board Member of The Restoration of Bird River Group.