Donnell Rehagen serves as the CEO of Clean Fuels Alliance America, biomass-based diesel’s preeminent trade association. With more than 115 member companies, Clean Fuels Alliance America is the leading U.S. organization representing the biodiesel, renewable diesel and sustainable aviation fuel industries. Rehagen works closely with the Clean Fuels board of directors to ensure the industry has a clear, sharp vision of the future. He provides leadership to Clean Fuels Alliance America’s highly competent and passionate staff and team of advocacy, technical, environmental science, and communications professionals in a dedicated drive to see the industry reach its vision of six billion gallons of demand by 2030. Formerly a fleet manager for the Missouri Dept. of Transportation, Rehagen joined the organization in 2004 as its Chief Operating Officer and assumed the role of CEO in 2016. He has a Master’s degree in Public Administration from the University of Missouri – Columbia and a Bachelor’s degree in Computer Information Systems from Missouri State University.

Dr. Steven Cliff was appointed by the California Air Resources Board (CARB) as Executive Officer (EO) in September 2022, where he leads nearly 2,000 employees that create and implement programs to reduce air and climate pollution. He recently was the 16th Administrator of the National Highway Traffic Safety Administration (NHTSA), leading efforts to set vehicle safety standards for the US.

Cliff has extensive scientific and regulatory experience. He previously served as CARB’s deputy executive officer, oversaw its climate program and was appointed by Governor Brown to Caltrans as the inaugural assistant director for sustainability. He has also led research efforts at the University of California, Davis related to air quality and climate change.

Cliff earned a bachelor’s degree and doctorate in chemistry from the University of California, San Diego, and was a postdoctoral fellow at the University of California, Davis’ Department of Land, Air and Water Resources.

Floyd Vergara retired as Director of State Governmental Affairs for Clean Fuels Alliance America in 2023. He spent more than 30 years at the California Air Resources Board, including as chief of the Industrial Strategies Division, and led the Environmental Justice Advisory Committee for 2 years.

Vergara has an accomplished career in the clean fuels industry. During his career at CARB, he oversaw key climate change and air quality programs, including the Low Carbon Fuel Standard (LCFS). Throughout Vergara’s tenure, the state affairs team helped establish and strengthen policies such as California’s LCFS, Oregon’s similar Clean Fuels Program and Washington’s new Clean Fuels Standard.

Vergara has a law degree from McGeorge School of Law and a B.S. in chemical engineering from the University of California, Berkeley, and practiced as a professional engineer and licensed attorney for 28 years. He resides in Sacramento, California where he enjoys spending more time with family, traveling, cycling, and hiking in his retirement.

Richard Battersby has over 30 years of experience in the fleet industry with over 25 years in alternative fuel vehicles including the implementation of the first ever alternative fuel vehicle program for Airborne Express freight company, the EV Sacramento program, and the State of California CNG and hybrid electric vehicle expansion programs. He is responsible for fielding over 3,000 alternative fuel vehicles, and was involved in the design and construction of numerous alternative fuel and EV charging stations throughout California.

Richard speaks frequently on clean air vehicle subjects at industry events and has participated in the successful award of over $15 million in clean air vehicle and infrastructure project funding. Richard holds multiple ASE Master Technician certifications and was inducted into both the DOE Clean Cities and Public Fleet Manager Halls of Fame. Most recently, Richard received the Legendary Lifetime Achievement Award from the Public Fleet Manager Hall of Fame, and the Benjamin Watson Inspirational Award from the Clean Cities Coalition Council. He has been with East Bay Clean Cities Coalition since 1998 and has served as the Coordinator and Executive Director since 2003. He also serves as a board member of the Transportation Energy Partners, Green Driving America, and the Bay Area Electric Vehicle Strategic Council and as Chairperson of the NAFA Fleet Management Association’s California Air Resources Board Committee.

Carlos M. Gutierrez is the Executive Director of the California Advanced Biofuels Alliance (CABA), a leading trade association committed to promoting the development and use of biofuels across California. Under his leadership, CABA advocates for Biodiesel and Renewable Diesel (BD/RD) producers and manufacturers, supporting policies that establish California as the market’s leader in biofuels.  In addition to his role at CABA, Carlos serves as a Governmental Advocate at Kahn, Soares, & Conway, LLP, representing a diverse clientele in the California State Legislature.  He holds a B.A. in Communication Studies from Sacramento State University.