Green Building United Staff

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Education & Engagement Manager

Marjorie Alexander


Marjorie (she/her & they/them) is responsible for supporting Green Building United’s programmatic work. Shortly before joining Green Building United, Marjorie moved from Los Angeles where she contributed much of her time to Sierra Club, other environmental non-profits, and various affordable housing advocacy groups. She is excited to be part of GBU in the movement for sustainable building and climate resilience here in Philadelphia. Marjorie holds a masters of science in environmental studies from Green Mountain College and brings additional experience in event planning and management, construction, and GIS.

Marjorie is also the host of A Sustainable Mind podcast where she interviews the change-makers behind some of today’s most impactful environmental campaigns, organizations, and startups.

Contact Marjorie with questions related to education, events, and volunteer opportunities.

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Interim Executive Director

Amy Cornelius



Amy is the Founder and Sustainability Consultant at GreenBeams, where she works with small businesses, institutions, and individuals to reduce their carbon footprints, utility costs, and waste streams, while increasing awareness, health and happiness. Amy has over 25 years experience in the real estate industry focused on project and construction management, commercial building management, residential rehabilitation, and developing business strategy, corporate forecasting, market research and new-business marketing. Amy holds a Master’s Certificate in Sustainable Design from Boston Architectural College, an MBA from the Kellogg School of Management at Northwestern University, and a BA in Economics from Trinity University. Her professional certifications include: LEED AP BD+C; Living Future Ambassador; and BPI Analyst/ Energy Auditor. Amy resides in Philadelphia with her husband Ben; their two children live and work in Washington, DC. Amy is an active garden designer and gardener, loves to read and travel, and, as a daily cyclist, is a strong cycling advocate.

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Program Manager

Winn Costantini

he/him & they/them

Winn (he/him & they/them) supports GBU’s capacity building and program work to advance equitable, affordable, and climate resilient communities through managing the Housing Equity Repair and Electrification for Climate Justice (HERE4CJ) Coalition in Philadelphia and the Pathways to Green Schools Program in Delaware.

Before coming to GBU, they earned a Master in City Planning degree from the Massachusetts Institute of Technology, where their work focused on the role of workforce development in climate, economic, and racial justice movements, as well as using geospatial analysis to improve water affordability and accessibility in U.S. cities. Prior to his time at MIT, he worked at Ceres, a Boston-based sustainability non-profit, engaging with institutional investors working on environmental, social, and governance issues through the Ceres Investor Network. He was also an outreach and education fellow at the Center for EcoTechnology, where he worked with households and small businesses to address energy efficiency and waste management challenges.

Contact Winn with questions related to HERE4CJ and Pathways to Green Schools.

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Philadelphia 2030 District Intern

Isabelle Coupet


Isabelle supports Green Building United’s Policy and Program Director to coordinate and grow the Philadelphia 2030 District. She is an architectural engineering student at Drexel University. Isabelle is interested in studying sustainable building practices and designs for the purpose of assisting in the development of sustainability goals.

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Program and Policy Director

LeAnne Harvey


LEED Green Associate

LeAnne (she/her) oversees the development, implementation, and evaluation of Green Building United's programming and policy work, working closely with staff, board, and volunteers on events, initiatives, and strategic planning. Before joining Green Building United, LeAnne worked for the City of Philadelphia’s Office of Sustainability, the Human Impacts Institute, and SCALE - a sustainability consultancy. She has a strong research background with a Master of Science in Climate Science and Policy from the Bard Center for Environmental Policy.

LeAnne is passionate about building sustainable and resilient communities; as such, she practices environmental and social justice activism, personal behavior change, and civic engagement. She grows and distributes food in her community garden and serves on the program committee with Historic Fair Hill. LeAnne is an ELP Senior Fellow and Climate Reality Leader.

Contact LeAnne with questions related to programs and policy.

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Development Director

Patricia (Pat) Ma


Through her work with local and national non-profit organizations focused on direct service, innovation and policy, Patricia (Pat) Ma (she/her) has cultivated expertise in big-picture thinking, designing programs for impact, and finding the philanthropic resources to move initiatives from idea to reality. She has designed and evaluated youth and workforce development initiatives; implemented programs for Philadelphia schools; and secured major funding for community-based arts, education and health efforts. Pat received her B.A. in economics and Chinese from Wellesley College and her Master’s in Public Policy from the Kennedy School Government at Harvard University.

Contact Pat with questions regarding Sustaining Partnerships, event sponsorships, membership, and donating to Green Building United.


Program Manager

Sophia Winston


Sophia Winston (she/her) is a graduate of the University of Pittsburgh (’16) and has a Master’s of City Planning from the University of Pennsylvania (’21) where she concentrated in Land Use & Environmental Planning and focused on the intersection of data and planning for climate resilience. In 2018 she was selected as a Fulbright Grantee to Brazil and became interested in sustainable development and land use planning during her time spent there. As Program Manager, Sophia manages the organization’s building energy benchmarking programs and is developing a capacity-building program for local organizations to incorporate climate resilience and sustainability practices into design, construction, and operations. She also assists with the implementation of the Philadelphia 2030 District and Building Energy Performance Program.

Legacy Partners

Platinum Partners

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