Investor Relations


Andrew J. Littlefair
President and CEO

Andrew J. Littlefair is President and CEO of Clean Energy, a company he co-founded with T. Boone Pickens in 1997.

Previously, Mr. Littlefair served as Vice President of Public Affairs at MESA Inc., then one of America’s largest independent producers of natural gas. In this role Littlefair oversaw the company’s natural gas vehicle activities and served as special assistant to Mr. Pickens.

Mr. Littlefair served as Chairman of NGVAmerica for 8 years from 2003 to 2011. In 2004, he was named an NGV Champion by the International Association of Natural Gas Vehicles (IANGV). In 2014, Mr. Littlefair received an Environmental Leadership Award from the California League of Conservation Voters for his work in renewable natural gas and building America’s Natural Gas Highway.

Mr. Littlefair graduated from the University of Southern California with a B.A. in Political Science. He and his wife have two sons.

Mitchell Pratt
Chief Operating Officer

Mr. Pratt serves as our Chief Operating Officer. In this role, Mitchell initiates business strategy and oversees production across all of Clean Energy’s divisions. Before coming to Clean Energy, Mitchell was the General Manager of the Natural Gas Vehicle (NGV) department for the Southern California Gas Company. His 18-year career represents a diverse background of leadership roles ranging from customer satisfaction, financial and distribution operations, to public policy, and sales and market development. He has a degree in Engineering as well as an MBA.

Robert Vreeland
Chief Financial Officer

Robert Vreeland serves as our Chief Financial Officer. In this role he manages the finances for Clean Energy while seeking new revenue opportunities in the marketplace. Prior to this, Bob served as Vice President of Finance and Accounting at Clean Energy from 2012 to 2014. Before joining Clean Energy, Bob was a consultant at RV CPA Services, PLLC, a provider of certified public accounting services. From 1997 to 2009, Bob held various finance and accounting leadership positions including Interim CFO at Hypercom, a global manufacturer of electronic payment and transaction equipment. Prior to Hypercom, he spent twelve years at accounting firm Coopers & Lybrand. He has extensive experience leading global finance and accounting teams as well as deep tax and financial planning expertise. Bob earned a B.S. from Northern Arizona University and is a certified public accountant.

James N. Harger
Senior Advisor to the CEO

Mr. Harger serves as our Senior Advisor to the CEO-Trucking responsible for collaborating with shippers, for-hire carriers and private fleets in their transition to adopting natural gas trucks in their supply chains and operations. He has been involved in the natural gas business for over 25 years, the past 16 years dedicated to marketing Natural Gas Vehicles (NGVs) and building fueling stations. James was the second employee of Pickens Fuel Corp. (the predecessor to Clean Energy) and assisted in Clean Energy’s (Nasdaq: CLNE) successful IPO, which raised $120 million in 2007. James earned a BS in Civil Engineering from UCLA and an MBA from Pepperdine University.

Barclay F. Corbus
Senior Vice President, Strategic Development

Mr. Corbus serves as our Senior Vice President, Strategic Development. In this role, Clay helps develop strategic growth opportunities, acquisitions and financing strategies for Clean Energy. Previously he was Co-CEO of WR Hambrecht & Co, the firm that managed Clean Energy’s 2007 IPO. Prior to that, he worked with Donaldson, Lufkin & Jenrette from 1989. He graduated from Dartmouth College with an AB in Government and has an MBA in Finance from Columbia Business School. Clay serves as a Director with three companies: Alaska Energy and Resources Co., and Goodwill of San Francisco.

Gary Foster
Senior Vice President, Corporate Communications

Mr. Foster serves as our Senior Vice President, Corporate Communications. In this role, Gary leads the development of all messaging strategies to ensure a brand consistency and relevancy that most effectively connects Clean Energy with its customers. Gary came to Clean Energy from Disney Consumer Products, where he oversaw external and internal communications, including PR. Prior to joining Disney, Gary spent more than 18 years in various industries, federal and state government agencies, and political campaigns. Earlier in his career, Gary served in President George H.W. Bush's Administration as Special Assistant to the President, Deputy Press Secretary, and Director of Public Affairs for the Department of Commerce. Prior to that, Gary worked as Director of Press Advance for President Ronald Reagan. He began his career as a regional campaign manager in Texas state political races. He earned a BA in Communications from the University of Texas at Austin.

Peter Grace
Senior Vice President, Sales

Mr. Grace serves as our Senior Vice President, Sales and Finance. In this role, Peter provides turnkey financial solutions to help governmental and private fleet operators take full advantage of natural gas vehicle technology. Prior to joining Clean Energy, Peter held several executive posts in the equipment leasing and finance industry. He has expertise in structuring sound financial transactions for both government and private industry. In addition, Peter has several years of hands-on production experience in the natural gas industry.

Nate Jensen
Vice President and General Counsel

Mr. Jensen serves as our Vice President and General Counsel. In this role, Nate oversees all business matters as they relate to corporate law. His extensive experience in the field includes particular emphasis on mergers and acquisitions, financing transactions and working with public companies. Prior to joining Clean Energy, Nate practiced law at Morrison & Foerster LLP. He received his law degree, magna cum laude, from the J. Reuben Clark Law School at Brigham Young University, and a BA in History, magna cum laude, from Brigham Young University. Nate is a member of the State Bar of California and the Business Law section of the American Bar Association.

Harrison Clay
Vice President, Renewable Fuels

Mr. Clay serves as our President of Clean Energy subsidiary Clean Energy Renewable Fuels. In this role, Harrison is responsible for leading Clean Energy’s efforts to produce and sell renewable natural gas (or biomethane) that is derived from the anaerobic decomposition of organic waste. He also serves on the Board of Managers for Clean Energy’s landfill gas processing companies: Dallas Clean Energy McCommas Bluff and Canton Renewables. Prior to joining Clean Energy, Harrison served as Director of Corporate Development and General Counsel at the San Francisco investment bank WR Hambrecht & Co. He has extensive experience in corporate and project finance, mergers & acquisitions, corporate development, venture capital and the clean tech and energy industries. Harrison earned his JD from the University of Virginia and a dual AB in Anthropology and English from the University of Georgia.

James L. Hooley
Vice President, Federal Government Relations

Mr. Hooley serves as our Vice President, Federal Government Relations. In this role, James manages Clean Energy's Washington DC office, seeking to enhance Clean Energy's and the NGV industry’s efforts there. Prior to joining Clean Energy, James worked at Unisys Corporation as Vice President of Government Relations, Global Public Sector. Earlier in his career, he served as a member of President Ronald Reagan’s Senior White House Staff with the rank of Assistant to the President. He also served as a Senior Political Advisor and Events Specialist for President George H.W. Bush and Senator Robert Dole.

Raymond P. Burke
Vice President, Business Development (Solid Waste)

Mr. Burke serves as our Vice President, Business Development (Solid Waste). In this role, Raymond focuses on developing new strategic growth opportunities for Clean Energy in the solid waste industry. He leads outreach efforts aimed at educating waste industry leaders on the benefits of using clean-burning natural gas fuel for their trash collection fleets. Prior to joining Clean Energy, Raymond served as Southern California Area Vice President for Waste Management, one of America’s largest solid waste companies. He began his career at a 50-route disposal company where he held operational posts leading up to General Manager. Raymond earned an MBA from Chapman University, Orange, CA.

Barbara Johnson
Vice President, Administration

Mrs. Johnson has been working with Boone Pickens in his natural gas endeavors for over 27 years. In her current role, she directs Clean Energy’s portfolio of grant funds which totals over $215 million. She also serves as Director of the company’s Global Risk Management and Human Resources departments. Her experience and expertise in the field of grant administration and reporting has earned her a stellar reputation with agencies vital to the success of the company, including: The U.S. Department of Energy, the Environmental Protection Agency, and the California Energy Commission. Barbara graduated from Vanguard University with a BA in Organizational Management.

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