Aemetis Leadership

Aemetis’ experienced management and board of directors pave the way for innovation in the industrial biotechnology industry.

Meet our Team

Eric A. McAfee

CEO, Chairman of the Board

Eric A. McAfee is a Silicon Valley entrepreneur and venture capitalist with a lifelong commitment to agriculture and renewable energy. He co-founded the Company in 2005 and has served as its Chairman of the Board since 2006. Mr. McAfee was appointed Chief Executive Officer of the Company in 2007. He has been both the Chairman of McAfee Capital and principal of the investment company Berg McAfee Companies since 1995 and 1998, respectively.

Mr. McAfee’s experience with successful business funding and acquiring speaks for itself: he founded or acquired twelve energy and technology companies when he became a principal of Cagan McAfee Capital Partners in 2000, as well as an additional twenty-five companies as a principal investor. In 2003, Mr. McAfee co-founded Pacific Ethanol, Inc., a West Coast ethanol producer and marketer. Mr. McAfee also founded the McAfee Farms Organic Almonds and Organic Pastures Dairy Company, the world’s largest raw milk and cheese producer, creamery, bottler, and distributor.

Since its creation, Aemetis is now the largest US-owned biodiesel producer in Asia and the largest biofuels plant in California, with more than 150 employees and $200 million in revenues.

Mr. McAfee is a graduate of both the Harvard Business School Private Equity and Venture Capital Program as well as the Stanford Graduate School of Business Executive Program. He received his Bachelor’s of Science Degree in Management from Fresno State University in 1986 and served as Entrepreneur in Residence of The Wharton Business School MBA Program in 2007.

Andy Foster

Executive Vice President, North America

Since joining Aemetis at the company’s founding in 2006, Andy Foster has held senior leadership positions including Executive Vice President, Chief Operating Officer and his current role as President of the North American Renewable Fuels business, which includes the company’s 65 million gallon-per-year biorefinery and renewable natural gas (RNG) production and distribution assets. Mr. Foster has directed the planning and implementation of over $150 million of capital investment projects that include the planning, engineering, construction, and operation of the company’s renewable fuels and energy efficiency initiatives.  Mr. Foster directs operations for the Aemetis ethanol biorefinery and related product sales and is responsible for managing the company’s regulatory affairs and carbon market (LCFS, RFS) compliance and monetization.

Prior to joining Aemetis, he served in senior management roles at Cadence Design Systems, BMC Software, and eSilicon Corporation. From 1989 to 1998, Andy served in the George H.W. Bush White House as Associate Director of Political Affairs and was Deputy Chief of Staff and Campaign Manager for Illinois Governor Jim Edgar. Mr. Foster holds a Bachelor of Arts degree from Marquette University.

Todd Waltz

Executive Vice President and Chief Financial Officer

Todd Waltz joined Aemetis as the Company Corporate Controller in 2007 before serving as our Executive Vice President, Chief Financial Officer, and Secretary in 2010. Mr. Waltz has been instrumental in listing the company on NASDAQ, arranging over $400 million of debt and capital,  managing investor relations, and overseeing legal and compliance matters of the company.  He currently directs the functions of accounting, financial planning, treasury, legal, IT, and human resources.

Prior to joining Aemetis, he began his career in commercial banking, followed by experience with Ernst & Young and Apple, Inc., where he served in senior financial management roles. Mr. Waltz holds a Bachelor of Arts degree from Mount Union College, an MBA from Santa Clara University, and a Master of Science degree in Taxation from San Jose State University.

Sanjeev Gupta

Executive Vice President, Aemetis International

Sanjeev Gupta, an experienced global marketer of specialized chemicals and oils, joined Aemetis in 2007 as head of Biofuels Marketing. In 2009, he became Executive Vice President of the Universal Biofuels subsidiary in India.

Prior to joining Aemetis, Mr. Gupta was the head of a petrochemical trading company with about $250 million of annual revenues and offices on several continents. He also was the General Manager of International Marketing for Britannia Industries, a subsidiary of Nabisco Brands, in India.

Board of Directors

Francis Barton


Francis Barton was appointed to the Company’s Board in 2012.  Mr. Barton’s career in finance has carried him through a variety of high-level executive positions, including  Executive Vice President and Chief Financial Officer of UTStarcom, Inc,  Executive Vice President and Chief Financial Officer of Atmel Corporation, and Executive Vice President and Chief Financial Officer of Broadvision Inc., to name a few.  Mr. Barton has served as Chief Executive Officer in the consulting firm Barton Business Consulting LLC since 2008. He began as a financial analyst in 1974 at Digital Equipment Corporation, working his way up to Chief Financial Officer of the Personal Computer Division.

Mr. Barton is no stranger to boards of directors; he has served on several, including ON Semiconductor, SoSo Cards, Inventergy, and Etubics, Inc. He has also served as Chairman of the Audit Committee for Inventergy and Etubics. Inc. He holds a B.S. in Interdisciplinary Studies with a concentration in Chemical Engineering from Worcester Polytechnic Institute and an M.B.A. with a focus in finance from Northeastern University.

Lydia I. Beebe


Lydia I. Beebe was appointed to the Company’s Board of Directors in 2016.  Ms. Beebe serves as the Company’s Chairman of the Governance, Compensation, and Nominating Committee and as a member of the Audit Committee.

Her years of experience with one of the world’s leading energy companies, Chevron Corporation, provide valuable experience to the board. Originally starting as a staff attorney in 1997, Ms. Beebe went on to serve as Chief Governance Officer and Corporate Secretary for eight years, as well as spending four years as a Washington D.C. Representative representing Chevron with the Executive Branch and the House of Representatives in 1981. She would later become the first female corporate officer in Chevron’s 127-year history when she was promoted to Corporate Secretary and an officer to the company in 1995. She held this position until 2007 when she also became the Chief Governance Officer and eventually retired in 2015.

Ms. Beebe holds a B. S. in Journalism from the University of Kansas, a J.D. from the University of Kansas, as well as an M.B.A. from Golden Gate University.  Ms. Beebe previously served on the boards of directors of HCC Insurance Holdings, Inc., the Council of Institutional Investors, Presidio Trust, University of Delaware’s Weinberg Center for Corporate Governance, and California Fair Employment & Housing Commission. She currently serves on the boards of Stanford University’s Rock Center for Corporate Governance, Kansas City Southern, and EQT Corp.

John R. Block


With experience as the United States Secretary of Agriculture under President Ronald Reagan, John R. Block has served as a member of the Company’s Board of Directors since 2008. His experience with agricultural commodities, political understanding, and prior board experience make him an excellent member. Mr. Block serves as a member of the Company’s Governance, Compensation, and Nominating Committee. Currently a Senior Policy Advisor to Olsson Frank Weeda Terman Bode Matz PC, he has also served as the Executive Vice President at the Food Marketing Institute and the President of Food Distributors International.

Mr. Block is currently a member of the board of directors of Digital Angel Corporation and Metamorphix, Inc. He previously served on the board of directors of each of Deere and Co., Hormel Foods Corporation, and Blast Energy Services, Inc.  Mr. Block received his Bachelor of Arts degree from the United States Military Academy.

Dr. Naomi L. Boness, Ph.D.


Dr. Naomi L. Boness joined the Company’s Board of Directors in 2020 as a member of the Audit Committee. Dr. Boness has extensive experience in energy, investment analysis, and strategic planning. She has served as the Managing Director of the Stanford Natural Gas Initiative since 2019. Her previous positions include the Senior Analyst for Upstream Strategy and Planning and Reserve Consultant at Chevron Corporation.

Ms. Boness received her Bachelors of Science. in Geophysics from the University of Leeds in 1998, her Master of Science in Geological Science from Indiana University, and her Ph.D. in Geophysics from Stanford University in 2006.

Mr. Timothy Simon


Mr. Simon was appointed to the CPUC by Governor Arnold Schwarzenegger in February 2007, ending his term in December 2012. During his time as a CPUC commissioner, Mr. Simon served as Chair of the National Association of Regulatory Utility Commissioners (“NARUC”) Natural Gas Committee; Chair of the LNG Partnership between the Department of Energy and NARUC; founding member of the Call to Action National Gas Pipeline Safety Taskforce with the U.S. Department of Transportation; and member of the National Petroleum Council. Mr. Simon currently serves on the board of Charah Solutions, Inc. (NYSE: CHRA).

Prior to his CPUC appointment, Mr. Simon served as Appointments Secretary in the Office of the Governor, the first African American in California history to hold this post. He also served as Adjunct Professor of Law at Golden Gate University School of Law and the University of California Hastings College of the Law. Prior to public service, Mr. Simon was an in-house counsel and compliance officer with Bank of America, Wells Fargo, and the Robertson Stephens investment bank.

In 2013, Mr. Simon created TAS Strategies, serving as an attorney and consultant on utility, infrastructure, financial services, and broadband projects. He is a frequent public speaker, expert witness and panelist on energy, infrastructure, diversity, and inclusion.

In 2019, Mr. Simon was elected Chairman of the Board of Directors for the California African American Chamber of Commerce and elected to the University of San Francisco Board of Trustees. He currently serves on the North American Energy Standards Board Advisory Council and is a member of the National Bar Association, Energy Bar Association, The Saint Thomas More Society and the National Board of Directors for the American Association of Blacks in Energy.  Mr. Simon received a bachelor’s degree in Economics from the University of San Francisco (Distinguished Alumni) and a Juris Doctor from the U.C. Hastings College of the Law. He is an active member of the State Bar of California.