Board of Trustees

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

Yamile Slebi, President

A native of Colombia, Yamile comes to sustainability from the world of social justice and international trade. Since moving with her family to Princeton in 2006, she has worked with numerous organizations whose goal is giving back to this diverse and welcoming community. You can find Yamile working on multiple initiatives that include green teams at local schools and a ‘save the trees’ campaign in her neighborhood.

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.

David Hill, 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.

Bruce Chung, Secretary

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.

Steve Averbuch, M.D.

Princeton residents since 2017, Steve and his wife Rachel 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, 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 actively advances public conversations regarding food impact on and health impact from climate change and what individuals can do to mitigate these.

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

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.

Betsy Marshall

A native of Virginia Beach, 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 has served on the faculty at the Rutgers School of Public Health for 20 years.  While at Rutgers, she has 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 are expanding.

Fran Price, Secretary

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.

Bruno Sarda

Bruno relocated to the area in 2016 and immediately fell in love with Princeton’s natural beauty. He led sustainability inside Fortune 500 companies for nearly 10 years, and now leads a large environmental non-profit based in New York. Bruno and his wife Jodi drive electric vehicles, buy 100% renewable energy for their home, participate in a local CSA, buy local and second-hand as much as they can, and avoid unnecessary consumption and packaging.

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.

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.

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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