Donna Lee, Co-Founder, Calyx Global

Donna has worked on climate change for over two decades. She previously served as a member of the SBTi Technical Advisory Group (TAG) and the ICVCM Expert Panel. She served as a climate change negotiator for the United States at the State Department and has advised governments, philanthropies, and companies. Her goals in life align with Calyx’s mission: to contribute to the well-being of people and to protect the planet.

Tanja Srebotnjak, Executive Director, Zilkha Center for the Environment, Williams College

Tanja has worked on sustainability strategy and operations and in a variety of settings. She obtained undergraduate and graduate degrees in statistics from Dortmund Technical University, Germany and the University of Auckland, New Zealand before joining the UN Statistics Division to work on environmental statistics and indicators. Seeing the growing need for data-driven sustainability assessment and decision-making, she pursued doctoral research in environmental statistics and policy from the Yale School of the Environment and was the director of the Yale-Columbia Environmental Performance Index (EPI). Since then she has led research, education and strategic initiatives to address sustainability, climate and environmental health issues in academia and K-12 education as well as for environmental advocacy and think tank organizations in the U.S. and Europe.

Nina Morris, Sustainability Director, University of Pennsylvania

Nina Morris is the Sustainability Director at the University of Pennsylvania, leading the Penn Sustainability Office and driving climate and sustainability action across campus. She facilitates the development, implementation, reporting, and communication for Penn’s Climate and Sustainability Action Plan (CSAP). Nina chairs the Ivy+ Sustainability Collaborative Offset Working Group and advances Penn’s carbon offset purchases for air travel. She directs external sustainability reporting, ensuring compliance, and promoting transparency in achieving Penn’s climate and sustainability goals. Through cross-campus and regional partnerships, Nina fosters innovation and systemic change, positioning Penn as a leader in sustainability. She holds a Master of Science in Environmental Design from Temple University and a Bachelor of Arts from Virginia Commonwealth University.

Steve Siger, Co-Founder, COO, CNaught

Steve Siger is cofounder and COO of CNaught, which is trusted by buyers like University of Pennsylvania, Harvard Business School, and Wellington Management, to make it easy to drive real climate impact through their carbon credit portfolios. Steve previously held multiple senior roles at early-stage companies including Uber and Thumbtack, where he served as General Counsel and acting head of finance. Earlier in his career, Steve served in multiple roles in the Obama Administration, including as Chief of Staff and Acting Deputy Assistant Attorney General in the U.S. Justice Department’s Office of Legal Policy and as Counsel to the National Commission on the BP Deepwater Horizon Oil Spill and Offshore Drilling.