Green Building United Staff

marjorie alexander headshot edited

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.


Interim Executive Director

Katie Bartolotta

Katie (she/her) brings 10 years of broad policy, organizing, and coalition building experience to her role as interim executive director of Green Building United.

During her tenure at Green Building United, Katie has focused on assessing opportunities, cultivating relationships, and delivering resources to the organization’s policy and programs work to make green building mainstream. Successes include modernizing building codes in Pennsylvania and Delaware; the passage of the Building Energy Performance Policy in Philadelphia; and launching the Philadelphia 2030 District and the Housing Equity Repair and Electrification for Climate Justice (HERE4CJ) Coalition where the organization serves as the convener of scores of local partners representing commercial, institutional, and residential sectors in efforts to decarbonize the built environment.

Katie holds a bachelor's degree in political science from the University of Rochester.

Contact Katie with questions related to policy and advocacy.


Program Manager

Winn Costantini

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.

staff 9757

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.

pwp 1419

Program and Communications Director

LeAnne Harvey

LEED Green Associate

LeAnne (she/her) leads and implements the Delaware Pathways to Green Schools and Building Energy Benchmarking programs. She also manages communications on behalf of the organization, working closely with staff 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, serves on the program committee with Historic Fair Hill. LeAnne is a proud ELP Senior Fellow, Climate Reality Leader, and DEEP Aerobics instructor.

Contact LeAnne with questions related to communications and initiatives.

img 3944

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

Enter your registered email address to receive password reset instructions:


Log in to your Green Building United account:

Reset Password