Board of Trustees

We are fortunate to have a dedicated Board of Trustees with a diverse skill set and a commitment to sustainable living.


Eve Coulson, President

In Princeton, Eve serves on the Princeton Zoning board and is active at the Princeton Jewish Center. She sees neighborhood building as an underestimated yet very powerful way to increase sustainable practices in daily life. She always takes the stairs—and she has discovered that sometimes the smallest things convey a big message. She carries a spork with her everywhere, which has not only saved the lives of countless plastic spoons and forks but sparked many conversations (“what IS that thing?”), about how one’s habits can have cumulative positive impacts.

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Alexandra Bar-Cohen, Vice-President

Locally, Alexandra served in AmeriCorps for the Princeton School Gardens Cooperative helping the garden club take root at Littlebrook School, and has demonstrated a continued passion about instituting low-waste measures to “green” events. She loves helping Princetonians discover how easy it is to be more sustainable—from chatting with people about thinking before they toss to organizing a sustainable fashion show at GreenFest. Alexandra recently retrofitted her 1932 home with a geothermal heating and cooling system, and is grateful that her EV means she’ll never have to pump gas again.
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David Hill, JD, Treasurer

An attorney with more than 25 years of experience working on energy and environmental matters, David is currently a Fellow and Adjunct Senior Research Scholar at Columbia University’s Center on Global Energy Policy and also advises private sector clients. Previously David served as general counsel of the U.S. Department of Energy from 2005 – 2009 and Executive Vice President & General Counsel of NRG Energy, Inc. from 2012-2018. In addition to serving on the board of Sustainable Princeton, David is board president of the Princeton Public Library Foundation and board treasurer of Arm in Arm, a nonprofit organization working to address food insecurity and prevent homelessness in Mercer County, NJ.
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Elizabeth (Betsy) Marshall , Ph.D., Secretary

Originally from Virginia, Betsy grew up in a family that appreciated the natural wonders of the area while trying to address environmental problems. Betsy has a doctorate in environmental and occupational epidemiology and served on the faculty at the Rutgers School of Public Health for 20 years. While at Rutgers, she collaborated on research and interventions to improve occupational health for immigrant workers along with teaching and other environmental health research. Betsy and her family have lived in Princeton since 2000. Betsy has served on the Princeton Township Bike and Pedestrian Committee and has volunteered with the Girl Scouts and Homefront. She and her family try their best to live sustainably, especially in their yard, where the lawn keeps shrinking, and the native plants keep expanding.
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Steve Averbuch, M.D.

A medical oncologist and pharmaceutical R&D executive leading cancer drug development for 40 years. Steve retired from Bristol-Myers Squibb in 2018 and he and his wife Rachel are Princeton residents since 2017. They both have a mindset regarding the environment and sustainability in everything they do. They practice whole foods plant-based eating, keep food and yard waste on their property, own and drive an EV, use renewable energy for their home, purchase carbon offsets for travel, and they consider the impact of each purchase and consumer action on the environment. Steve is active with several national and local environmental organizations focusing on solutions for the harmful impact of climate change and fossil fuels on human health and cancer outcomes.
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Michael Chung

As Senior Manager of Sustainable Packaging at Johnson & Johnson, Michael’s professional career is dedicated to transitioning the consumer product industry towards a circular plastics economy where no plastic packaging becomes waste. A dedicated volunteer at Sustainable Princeton, Michael served on the Princeton Climate Action Plan, Materials Management committee and the Marketing Task Force before joining the Board of Trustees. Michael has lived in Princeton with his wife Val and two sons since approximately 2016. He has served as a coach at the YMCA youth basketball league and is an active leader in his neighborhood.

Stuart Lieberman, Esq.

Stuart is a founding member of Lieberman Blecher & Sinkevich, a law firm with over 30 years of environmental and land use experience. With a primary focus on environmental litigation in state and federal court, as well as the Office of Administrative Law, Stuart’s expertise is largely focused on pre- trial litigation, trial discovery, and courtroom advocacy. Previously Stuart served as a former state Deputy Attorney General, who represented the New Jersey Department of Environmental Protection. Stuart has provided counsel to the Passaic River Coalition, an organization committed to protecting valuable water resources in the State of New Jersey, and is active at the Jewish Center of Princeton. A long-time Princeton resident with his wife Beverly, Stuart is a committed grandfather whose devotion to the environment comes from his desire to leave a healthy planet to his grandchildren.
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Greg Evans

Greg has more than 35 years of professional experience spanning four industries including Healthcare Sustainability, Banking/Financial Management, Environmental Management and Technology Consulting, Importing and Distribution/Retail, and Commercial Property Development. Greg currently serves as the Corporate Director of Sustainability for Penn Medicine. Jersey-shore born, he and his wife Sue have been Princeton residents since 1992.
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Bruce Chung

Bruce currently works as Senior Vice President, Strategy and M&A for NRG Energy and has been a resident of Princeton since 2011. Bruce has enjoyed watching the partnership between Sustainable Princeton and NRG Energy grow over the years, and is proud to be a part of two organizations with a commitment to fostering Princeton’s ongoing sustainability mission. Prior to joining the Sustainable Princeton Board, Bruce served one three-year term on the Board of the Trenton Area Soup Kitchen.
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Fran Price, MF

After spending time in small communities in the northern mountains of the Dominican Republic planting trees and installing solar panels as a Peace Corps volunteer, Fran decided to make forest conservation her career. She has worked for The Nature Conservancy on forest issues for almost 18 years to incentivize better practices within the global forest industry. Fran lives with her husband Will (who also works in conservation) and two boys in a very “green” house in Princeton.
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Bruno Sarda

Bruno relocated to the area in 2016 and immediately fell in love with Princeton’s natural beauty. He has been working professionally in sustainability since 2010, including as chief sustainability officer in Fortune 500 companies, as president of a leading environmental non-profit based, and now as a partner at Ernst & Young where he helps lead the sustainability consulting practice. Bruno and his wife Jodi drive electric vehicles, buy 100% renewable energy for their home, follow a mainly plant-based diet, buy local and second-hand as much as they can, have electrified all their lawn and yard care equipment, and avoid unnecessary consumption and packaging.
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Gail Ullman

Gail’s career began with scholarly publishing, followed by decades of public involvement through Master Gardening, Princeton Environmental Commission, and the Princeton Planning Board. Her involvement with Sustainable Princeton expresses her commitment to good planning in the interests of our community and its environmental health.
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Mia Sacks, Council Liaison

A third-generation Princetonian, Mia is passionately committed to ensuring Princeton’s continued evolution as an equitable, sustainable and vibrant community. Her professional background working around the world in human rights, public health and civil liberties has enabled her to provide thoughtful and strategic guidance that informs Sustainable Princeton’s efforts. Willing to put in the time and sweat equity required to make change happen, Mia can be found most evenings at a municipal or public school meeting advocating for sustainable planning and growth.
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Shana Weber, Ph.D., University Liaison

Shana Weber, Director of Sustainability at Princeton University, is a nature lover and works to stimulate local problem-solving to accelerate sustainability action across all of higher education. While not a Princeton resident, she is excited to support community-wide action as a University partner. She and her family are passionate about tinkering with and enhancing native habitats in her yard.
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