John Holler is the Low-Carbon Fuels and Transportation Senior Fellow at the Center for Climate and Energy Solutions (C2ES). He researches and analyzes the technologies, markets, and policies required to advance widespread adoption of low-carbon fuels toward the decarbonization of hard-to-abate sectors. Mr. Holler engages with the organization’s technology working groups, regional roundtables, and policy advocacy campaigns.  

Before joining C2ES, Mr. Holler led the World Wildlife Fund’s aviation decarbonization program with a specific focus on alternative fuels. Under this work, Mr. Holler advanced policy and corporate frameworks for the sustainable production and uptake of low-carbon fuels and their feedstocks, including US policy advocacy and international engagement under the International Civil Aviation Organization (ICAO). Prior to the World Wildlife Fund, Mr. Holler worked for Verra, where he supported the operation and development of carbon market and sustainability standards, including the management of their California Cap-and-Trade offset portfolio.  

Mr. Holler holds a Master of Environmental Law and Policy from Vermont Law School and BAs in political science and environmental studies from the University of Vermont.