At CFO (Boardroom Media) we track over 1,000,000 startups and over 5,000,000 people who hold key positions in these companies. We use this directory of startups to highlight top employees, founders and board members we think deserve more appreciation than they are currently getting.
This list showcases the top United States based CFO’ operating in the CleanTech space. If you think a CFO’ is missing from this list, feel free to contact our editor on [email protected].
The individuals on this list have been included because of exceptional performance in one of the following categories:
- Innovation – Operating as a key part in an extremely innovative business or startup.
- Growth – Operating as a key figure in the growth and upscale of a market leading business or startup.
- Management – Showing exceptional management skills.
- Societal impact – Putting their business on the map for their positive societal or environmental impact.
Our Data – We source our data from OSINT (open source intelligence) and public directories such as Crunchbase, SemRush and many more. The data from these sources should be treated with a degree of caution and verified yourself.

Steven Bragonier
CFO and Co-Founder of Neotribe Ventures
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About Gainspeed, Neotribe Ventures: Neotribe Ventures is an early stage-venture capital firm which invests in breakthrough technologies that stretch the imagination.
Han Kieftenbeld
Chief Financial Officer of Amyris
Han Kieftenbeld joined Amyris as Chief Financial Officer in March 2020. He brings over 25 years of international business leadership, finance and operations experience in food, health and nutrition end-markets. Most recently, from April 2016 to April 2019, Mr. Kieftenbeld served as Senior Vice President and Chief Financial Officer of Innophos Holdings, Inc., a leading international science-based producer of essential ingredients for health and nutrition, food and beverage and industrial brands. From June 2014 to July 2015, Mr. Kieftenbeld served as the Global Chief Financial Officer at AB Mauri, a worldwide leader in bakery ingredients. Prior to that, Mr. Kieftenbeld held finance and operations roles of increasing reach and impact, including serving as Global Chief Procurement Officer of Ingredion Incorporated, and Global Chief Financial Officer of National Starch. Mr. Kieftenbeld started his career at Unilever in the Netherlands. In 2006, Mr. Kieftenbeld earned a joint master’s degree from New York University Stern School of Business, London School of Economics and Political Science, and the HEC School of Management, Paris. He holds a B.S. in Business Economics and Accounting from Windesheim University in the Netherlands.
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About Amyris: Amyris Biotechnologies specializes in creating renewable products focusing on fuels and chemicals.
Marie Drez
CFO of The Westly Group
Marie Drez is the CFO at Core Ventures Group. She manages the Finance and Administration functions for the Noventi funds, including funds financials, audit and tax, funds administration, limited partners reporting, banking and portfolio companies monitoring. Prior to joining Noventi, Marie Drez held financial management positions at DoOnGo Technologies, a wireless software company, and at other high technology companies. Previously she served in accounting and financial positions at Westcoast Savings and Loan and at Macy’s. Marie Drez earned a Bachelor’s of Science degree in Psychology, with business emphasis, from the University of California, Los Angeles.
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About Core Ventures Group, The Westly Group: The Westly Group is one of the largest venture funds in North America focused on smart energy, transportation, and buildings.
James Rens
Chief Financial Officer of Monolith Materials
James Rens is the Executive Vice President & Chief Financial Officer of Philadelphia Energy Solutions LLC. Prior to joining Philadelphia Energy Solutions, James Rens was the CFO of Executive AirShare Corporation. Prior to Executive AirShare, James Rens served as the Chief Financial Officer and Treasurer of CVR Energy, Inc., its predecessors and affiliates. Before joining CVR Energy, Inc., James Rens was a consultant to Pegasus Capital Investors through the acquisition of the assets that comprised CVR Energy, Inc. from November 2003 to March 2004; Assistant Controller at Koch Nitrogen Company from June 2003, which was when Koch acquired the majority of Farmland’s nitrogen fertilizer business, to November 2003; and Director of Finance of Farmland’s Crop Production and Petroleum Divisions from January 2002 to June 2003. From November 1995 to January 2002, James Rens was Controller and Chief Financial Officer of Farmland MissChem Limited and Farmland Hydro L.P., respectively. James Rens has spent over 25 years in various accounting and financial positions associated with the fertilizer and energy industries. James Rens received a Bachelor of Science degree in Accounting from Central Missouri State.
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About Monolith Materials, Philadelphia Energy Solutions: Monolith Materials is a carbon black manufacturing company that uses a proprietary process to convert natural gas to carbon black.

David Nanidzhanyan
CFO of RueOne Investments
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About RueOne Investments: RueOne is a private investment firm making early to growth stage investments in FinTech / InsurTech / Enterprise Software.

Nicholas Dardugno, Jr. Cpa
Chief Financial Officer, CPA of GoSun
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About GoSun: GoSun offers solar technology that provide fuel-free cooking, cooling, charging, lighting and water purification and more!
Mark DeVita
CFO of Heritage-Crystal Clean
CFO at Heritage-Crystal Clean.
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About Heritage-Crystal Clean: Heritage-Crystal Clean is a leading provider of parts cleaning, used oil, re-refining, and hazardous and non-hazardous waste services
Mark DeVita
CFO of Heritage-Crystal Clean
CFO at Heritage-Crystal Clean.
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About Heritage-Crystal Clean: Heritage-Crystal Clean is a leading provider of parts cleaning, used oil, re-refining, and hazardous and non-hazardous waste services
Charles Tate
Chief Financial Officer of Elevance Renewable Sciences
Chad has more than 20 years of experience in finance and administration from diverse industries including analytical testing, life sciences, logistics and software development. Prior to joining Elevance, Chad was the Director of Finance for Environmental Health and Safety, US Division, at SGS North America and previously held several positions at Accutest Laboratories, including Chief Financial Officer and Chief Accounting Officer. Chad is a CPA, and earned his B.S. degree in accounting from Salisbury University.
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About Elevance Renewable Sciences: Elevance Renewable Sciences creates a range of valued specialty chemicals from natural oils.
Lisa Potocsnak
CFO of Artveoli, Inc.
Lisa Potocsnak is the CFO at Tribe Capital.
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About Artveoli, Inc., Tribe Capital: Carbon Capture Company

Joseph Wiendl
Chief of Staff & CFO of Joi Scientific
Joseph Wiendl, CFA CPA, brings more than 20 years of diverse financial and business development experience to Joi Scientific. He has held senior positions with investment and merchant banks including Raymond James and Macquarie Capital, and brings a wealth of industry knowledge from the venture capital, industrials, alternative energy, aviation/aerospace, defense, and government coverage areas. Wiendl was appointed by Governor Jeb Bush to serve as a commissioner and then as an economic development officer for the State of Florida, overseeing aerospace industry development strategy. Earlier in his career, he worked for Lockheed Martin as an internal consulting team member and served in the U.S. Navy as a qualified surface warfare officer with tours in engineering and combat operations. Wiendl is a Certified Public Accountant, holds the Chartered Financial Analyst designation, serves on the Audit Committee of Leadership Florida, and is a member of the International Society for Philosophical Enquiry. He has an accredited Aerospace Engineering degree from the U.S. Naval Academy, an MBA degree in Finance from the Wharton School at the University of Pennsylvania, and an MS degree in Accounting from the University of Tampa.
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About : Is developing clean, abundant and affordable hydrogen gas from water, on-demand, at the point of use. We call this Hydrogen 2.0.

Charles Dargan
CFO of BioLargo
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About BioLargo, CFO 911 Solutions: BioLargo provides solutions to keep water, air, food, energy, people, plants, and animals clean, safe, and healthy.
Nate Richards
CFO & Co-founder of Enerex
Nate Richards is a veteran entrepreneur, having started his first company in 2003, growing it to place 6 times in the Inc 5000 list. Depth areas include Energy (the entire value chain from oil & gas to utilities to retail energy), SaaS, and entrepreneurial strategy, where Nate has completed coursework at Harvard Business School’s Executive Education program.
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About Enerex, Entrance Software Consulting: Retail Energy’s Trusted Data Platform
Larry Beyer
COO & CFO of Junkless
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About Junkless, Junkless: Junkless dedicated to making breakfast and snack foods simpler with all natural, common kitchen pantry ingredients you know and trust.
Derek LaClair
CFO and Founder of EMPEQ
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About EMPEQ: EMPEQ provides modern energy equipment to small and mid-size businesses.

Paul Marcondes
CFO of Shift Energy Holdings, Inc.
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About Shift Energy Holdings, Inc.: Shift Energy is an engineering company that designs, develops and operates renewable fuels plants using waste feedstock.
Gene Lynes
Chief Financial Officer of Wildcat Discovery Technologies
Gene Lynes is the chief financial officer of Wildcat Discovery Technologies. Gene has more than thirty years of experience in finance management and over fifteen years working with technology based businesses. His experience includes involvement with more than a dozen M&A transactions as well as the raising of more than $2.5 billion of capital. Prior to joining Wildcat in 2017, Gene was the Chief Financial Officer at Kyriba Corp. where he helped lead two rounds of equity financing and obtain two new debt facilities. Before joining Kyriba Corp., as EVP and CFO of Ecova, Inc. he helped complete five acquisitions as well as the sale of the company to Cofely USA – a subsidiary of Engie (EPA: ENGI) – having been instrumental in raising both debt and equity capital. Throughout his career, Gene has focused on assisting businesses in the development of financial and operational processes and discipline to support periods of rapid growth. Earlier in his career, he spent more than seven years in audit working for both EY and PwC while achieving the level of Senior Audit Manager. Gene holds a Bachelor of Science in Business Administration with emphasis in Accounting degree and a Master of Science in Finance degree from San Diego State University. Gene has also completed an executive development program through the Wharton School of the University of Pennsylvania.
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About Wildcat Discovery Technologies: Wildcat Discovery Technologies is a developer of materials for the use in batteries.
Gene Lynes
Chief Financial Officer of Wildcat Discovery Technologies
Gene Lynes is the chief financial officer of Wildcat Discovery Technologies. Gene has more than thirty years of experience in finance management and over fifteen years working with technology based businesses. His experience includes involvement with more than a dozen M&A transactions as well as the raising of more than $2.5 billion of capital. Prior to joining Wildcat in 2017, Gene was the Chief Financial Officer at Kyriba Corp. where he helped lead two rounds of equity financing and obtain two new debt facilities. Before joining Kyriba Corp., as EVP and CFO of Ecova, Inc. he helped complete five acquisitions as well as the sale of the company to Cofely USA – a subsidiary of Engie (EPA: ENGI) – having been instrumental in raising both debt and equity capital. Throughout his career, Gene has focused on assisting businesses in the development of financial and operational processes and discipline to support periods of rapid growth. Earlier in his career, he spent more than seven years in audit working for both EY and PwC while achieving the level of Senior Audit Manager. Gene holds a Bachelor of Science in Business Administration with emphasis in Accounting degree and a Master of Science in Finance degree from San Diego State University. Gene has also completed an executive development program through the Wharton School of the University of Pennsylvania.
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About Wildcat Discovery Technologies: Wildcat Discovery Technologies is a developer of materials for the use in batteries.
John Holland
CFO of Avista
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About Avista: Avista is an energy company involved in the production, transmission, and distribution of energy.
John Holland
CFO of Avista
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About Avista: Avista is an energy company involved in the production, transmission, and distribution of energy.
Maria Lima
Chief Financial Officer of MZL Shine Cleaning
Co-Owner
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About MZL Shine Cleaning: There is an opportunity in Central Falls, Rhode Island to open and operate an innovative successful company.
Maria Lima
Chief Financial Officer of MZL Shine Cleaning
Co-Owner
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About MZL Shine Cleaning: There is an opportunity in Central Falls, Rhode Island to open and operate an innovative successful company.