Karin Sosis Executive Director
Karin Sosis is a sustainability expert with 20 years of experience working with government and business on climate policy reform, clean energy market development, green behavior change, and social justice.
After college at Duke University, Karin had early jobs in finance and book publishing in New York City, during which time she becoming increasingly concerned about environmental degradation and climate change. She decided to pursue an environmental career and in 2008 got a Master’s in Environment and Development from the London School of Economics.
Karin went on to work for 15 years in Africa as a technical advisor and project manager covering renewable energy, energy efficiency, climate change adaptation, energy access and financing, regenerative agriculture, green infrastructure, and environmental justice. In the African context, as herein the U.S., these challenges are intertwined with issues of social equity, access to finance, and economic opportunity. She worked with national governments, investors, companies, and civic organizations in 25 countries to support a fair transition away from fossil fuels.
Karin was raised in New Rochelle and has lived in London, Liberia, Zambia and Kenya. In July 2025 she returned to the U.S. with her family and is delighted to join Groundwork at a time when climate action is more important than ever.
Henry Jorden Program Director
Henry is a social worker with a background in environmental stewardship and non-profit administration. He is motivated to direct programs that facilitate moments of connection with the natural world and lead to positive community-driven environmental change. His passion for this work began while leading trail maintenance and wilderness expedition programming with the U.S. Forest Service and non-profit organizations in his home state of Montana.
He pursued his graduate studies in social work in New York City where he completed his field education at Green City Force. Prior to his role at Groundwork Hudson Valley, he designed and implemented environmental stewardship, education, and youth programming with The Bronx is Blooming in green spaces across the South Bronx. At Groundwork Hudson Valley, he manages grants and oversees three program areas: Sustainability Education, Youth, and Community Adaptation.
Henry earned a B.A. in Political Science from Carroll College, focused on natural resource management in the Mountain West, and a Master of Social Work from Columbia University, where his research centered on green infrastructure investment without displacement.
Karen Tumelty Director of Development and Communications
Karen’s career has ranged from working as on-air DJ for a commercial radio station, to product manager for the Irish-American Hip Hop group House of Pain (of Jump Around fame), to building and executing fundraising and growth strategies for organizations including Human Rights First, Riverkeeper, and Greyston.
At Riverkeeper, highlights of her achievements included working with allies like Whole Foods to build awareness about the environmental and cultural importance of the Hudson River. The Earth Month campaign that she created for all of the NYC Whole Foods Markets increased web traffic to over 1,000,000 hits per month and significantly increased online donations. Her non-confrontational approach to story-telling has created new levels of understanding of people and communities that have been marginalized and excluded. For example, while at Greyston, she inspired one of the most iconic social enterprises,The Body Shop, to adopt Open Hiring practices at the distribution center and in their retail stores. This, in turn, resulted in increased donor confidence and gift size. She works from a core value of listening to people and helping them connect to the work that will help them be the change they want to see in the world.
Karen is an avid cook who enjoys exploring new cultures through flavor and is also an accomplished knitter. She was raised in Yonkers and has lived in our community for much of her life. She has served as Vice Chair of the Yonkers Human Rights Commission, was the founding Chair of the Yonkers Alliance for Latino and Immigrant Services, and was the Formation Chair for the Yonkers St. Patrick’s Day Parade for many years.
Miriam Foley Finance and Operations Manager
Miriam holds a B.A in Computer Science from Queens College and started her career as a computer programmer. While taking time off to raise her two sons, she became very involved in the Yonkers community and held many positions, including President of the Yonkers Council of PTA/PTSAs. By combining all of the knowledge and skills she acquired, Miriam returned to paid work in the nonprofit sector as a Grants and Finance Manager for local community organizations. As the Finance and Operations Manager for Groundwork, Miriam provides office support for all of Groundwork’s community programming, which reflect her interests in the local community (especially the schools), the environment and the arts.
Joel Rodriguez Sustainability Education Program Senior Manager
Joel is an environmental and sustainability education leader with 25 years of experience creating, managing, and scaling high-impact learning initiatives for students and adults. Guided by the core belief that environmental education should be hands-on, lived, and accessible to everyone, he has dedicated his career to connecting communities with ecological science and practical sustainability.
In his current role as Sustainability Education Senior Manager and Captain of the Science Barge—an off-the-grid, floating hydroponic farm—Joel bridges interactive discovery with cutting-edge environmental science. Under his leadership, the Barge delivers STEM and green infrastructure curricula in classrooms, online, and on deck, while collaborating with field experts and citizen scientists to monitor and protect the health of the Hudson River.
Previously, Joel served as Director of Environmental Education at the City Parks Foundation, where he oversaw the creation and citywide expansion of school-day, afterschool, and summer enrichment programs across all five boroughs of New York City, ensuring under-resourced communities had equitable access to nature education.
At the local level, Joel serves as the Sustainability Coordinator and Zoning Board member for his hometown of Elmsford, New York, guiding green policy and representing the village on the Saw Mill Watershed Advisory Board.
Joel holds a B.A. in Environmental Studies from the University at Buffalo, a Graduate Certificate in Higher Education Administration from Northeastern University, and an M.A. in Global Sustainability from the University of South Florida. An avid naturalist at heart, he spends his free time studying fungi, fossils, and aquatic and terrestrial invertebrates, with a strong commitment to waste reduction, upcycling, and food security.
Margo Feingold Youth Program Manager
Margo Feingold is an environmental education and youth development professional with experience in program management, place-based learning, and community engagement in the nonprofit sector. Her work focuses on creating inclusive, hands-on educational experiences that foster environmental stewardship, leadership skills, and strong connections between young people and their communities.
Most recently, Margo served as Programs Manager at Friends of the Bridger-Teton, the nonprofit partner to the Bridger-Teton National Forest in Wyoming, where she led outreach and education programs supporting sustainable recreation and forest stewardship across 3.4 million acres of public land. She managed a volunteer program, supervised interns, and collaborated closely with the U.S. Forest Service and community partners to design and deliver impactful, community-facing initiatives. Previously, she worked as a Field Instructor with Teton Science Schools, facilitating immersive science and environmental education programs in Grand Teton and Yellowstone National Parks, with a focus on experiential learning and youth engagement.
Margo holds a Master’s degree in Environmental and Natural Resource Management from the University of Iceland, where her research examined the political ecology of protected areas, and a B.A. in Environmental Studies from Hampshire College. Originally from New York, she is excited to return to the Hudson Valley and bring her experience in education, stewardship, and youth leadership to Groundwork Hudson Valley’s programs. In her free time, Margo enjoys spending time outdoors, exploring local trails and waterways, and staying connected to the natural landscapes that inspire her work.
Andrew Harris Community Adaptation Manager
Driven by a commitment to equity and access in the built environment, Andrew has spent his career at the intersection of design, community engagement, and capacity building. With twelve years in architecture and design, followed by five years in community and economic development, Andrew brings a unique perspective to creating spaces that positively impact communities. He contributes to projects that foster a more just and equitable society, starting with the places we live, work, and play.
True community engagement is a priority in Andrew's professional work. In 2021, Andrew transitioned from architecture to pursue work centered in community and connection. His work has connected us with communities city-wide, planning and facilitating multi-scaled community engagements on all scales - with large cultural institutions as well as small community-based organizations. His goal is to create vibrant, equitable spaces that reflect the rich cultural tapestry of New York.
Andrew holds a B.A. of Arts in Architecture from the University of Pennsylvania and an M.A from Pratt University.
Christina Weiler Community Adaptation Senior Associate
Christina Weiler is a creative, impact-driven climate professional passionate about environmental stewardship. She aspires to contribute to organizations that build power and capacity within communities affected by climate change.
As a Clinton Global Initiative Fellow, Christina created a program in partnership with the New Rochelle City Planning Office to engage youth in researching park access and walkability in low-income areas of their city. She also created and ran a sustainability consulting nonprofit for small businesses in her college town and worked as an intern for SWEEP, which developed an environmental performance standard for solid waste facilities across the US.
Christina loves designing community engagement tools that empower participants to share perspective and build consensus toward actionable goals. Most recently, she was a community educator designing and leading intercultural and trilingual activities in public schools in Spain under a Fulbright grant. There she learned how environmental education fits naturally into curriculum for children, in particular how children can learn from neighbors and family members who have connections to agriculture.
Christina holds a Bachelor of Arts in Environmental Studies with minors in Economics and Latin American Studies from Colgate University.
Zoe Camhi Sustainability Education Program Senior Associate
