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Russ StidolphChairmanRead full bio
Russ Stidolph
Chairman
Russ Stidolph has served as Chairman of Eos since 2018. Mr. Stidolph is the founder AltEnergy, LLC a private equity firm focused on alternative energy investing, where he has served as Managing Director since 2006. Prior to forming AltEnergy, Mr. Stidolph was a Principal at J.H. Whitney & Co., LLC a middle-market private equity firm based in New Canaan, Connecticut. While at J.H. Whitney Mr. Stidolph was responsible for starting and developing the firm’s alternative energy investing practice where he was responsible for Hawkeye Renewables, LLC and Iowa Winds, LLC. Mr. Stidolph was both the Chief Financial Officer and Vice Chairman of Hawkeye Renewables, LLC before it was sold in 2006 to Thomas H. Lee Partners, LP. Prior to joining J.H. Whitney, Mr. Stidolph was a member of the corporate finance group at PaineWebber, Inc., that was responsible for high yield and leverage finance origination. Mr. Stidolph also acted as Senior Vice President and the Chief Financial Officer of Tres Amigas, LLC and he still sits on the Company’s Board of Directors, and was Chairman of the board of directors of Viridity Energy, Inc before it was sold to Ormat Technologies in 2017. Russell received a Bachelor of Arts degree from Dartmouth College. -
Jeff BornsteinDirectorRead full bio
Jeff Bornstein
Director
Jeff Bornstein has served as a member of our board of directors since September 2022. Mr. Bornstein is the Founder, Principal and Co-Managing Partner of Whipstick Ventures LLC, an investment company focused on early stage companies with novel solutions across energy storage and efficiency, services, bio-tech and fin-tech. He also currently serves as the Managing Partner of Generation Capital Partners and sits on the board of AlloVir, a public biotech leader. Prior to founding Whipstick Ventures in 2018, he served as Vice Chairman and Chief Financial Officer of General Electric from 2013 to 2017. In this role, he focused on portfolio transformation, including the sale of the Appliances division of GE, executing the merger of GE Oil & Gas with Baker Hughes, the sale of businesses and assets of GE Capital worth over $300 billion and GE’s acquisition of Alstom, as well as driving down structural costs. Previously, Bornstein served as Senior Vice President and Chief Financial Officer of GE Capital for 12 years. During his tenure GE Capital grew earnings by four times. He played a pivotal role managing the company through the financial crisis and, subsequently, the on-boarding of the Federal Reserve as Regulator. Bornstein mentored and developed a generation of Finance leaders that continue to lead GE, as well as, many other public and private companies. Bornstein originally joined GE in 1989 with the GE Power Systems’ Financial Management Program. In 1992, he joined the GE Corporate Audit Staff and then became Executive Audit Manager. In 1996, he was named Chief Financial Officer for GE Aircraft Engine Services and Vice President in 1998. In1999, he was promoted to Chief Financial Officer of GE Plastics and served in that role until 2002. He is a trustee of Northeastern University and on the board of Build On. He has also been involved in a number of youth programs. He received his B.S. in Business Administration from Northeastern University. -
Claude DembyDirectorRead full bio
Claude Demby
Director
Claude Demby has served as a member of our board of directors since August 2021. Mr. Demby is currently President of Cree LED, a SMART Global Holdings, Inc. lighting innovation company, and has extensive executive leadership experience holding senior roles within the automotive, aerospace and materials technology industries. Prior to joining Cree LED, Mr. Demby served as CEO and Director of the Noël Group, a global manufacturer of synthetic foam materials, and President and COO of L&L Products. He began his career in engineering roles with Procter & Gamble and GE Plastics. Mr. Demby has extensive Board experience, as he currently serves as Chair of the Nominating and Governance Committees and Board Director of Brown Capital Management Mutual Fund Trust. He is also a Board Director and Chair of the Nominating and Governance Committees of Piedmont Lithium Inc., a clean energy company, and previously served as a Board Director of the Federal Reserve Bank of Richmond’s Charlotte branch, including as Chairman from 2012 to 2017. In addition to his professional experience and corporate board service, Mr. Demby has a strong record of community service through his founding and running of Valour Academy Schools, Inc., in Raleigh, NC, and serving as an advisory Board member of Duke Raleigh Hospital. He received an MBA from Rensselaer Polytechnic Institute and a Bachelor of Science degree in Chemical Engineering from the University of Delaware.
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Alex DimitriefDirectorRead full bio
Alex Dimitrief
Director
Alex Dimitrief has served as a member of our board of directors since November 2020. Mr. Dimitrief is an experienced director, Chief Executive Officer, C-suite leader and general counsel who has steered varied energy-related and other global businesses through a wide range of complex commercial, legal and organizational challenges. He has previously served as a director of both public and non-public companies including The We Company, Synchrony Financial (NYSE: SF) and GE Capital Bank and presently sits on the Advisory Board of Cresset Capital Management. As President and Chief Executive Officer of General Electric’s Global Growth Organization, Mr. Dimitrief was responsible for driving GE’s growth in more than 180 countries. Under Mr. Dimitrief ’s watch in 2018, GE achieved $76 billion in international orders and secured billions in financing for many of GE’s emerging market customers. As GE’s General Counsel, Mr. Dimitrief served as the principal executive advisor to GE’s Board and led a global team responsible for GE’s legal matters, compliance, SEC reporting, government affairs and environmental safety programs. In previous roles at GE, Mr. Dimitrief was a leader of the transformation of GE Capital (including the IPO/split-off of Synchrony Financial) and led joint venture negotiations for GE Energy in China and Russia. In announcing Mr. Dimitrief ’s retirement from GE in January 2019, Chief Executive Officer Larry Culp described Mr. Dimitrief as “one of the most respected leaders at GE” who “effectively represented GE before governments, regulators and customers throughout the world and is widely recognized as a compelling champion of integrity, transparency and the rule of law.” In 2007, Mr. Dimitrief came to GE from after 20 years as a senior partner at Kirkland & Ellis LLP, where he “first chaired” and regularly advised Boards about securities, restructuring, intellectual property, product liability, environmental, governance and commercial disputes. Mr. Dimitrief earned his B.A. from Yale College and his J.D. from Harvard Law School. -
Joe MastrangeloDirectorRead full bio
Joe Mastrangelo
Director
Joe Mastrangelo has served as a board advisor since March 2018 and as our Chief Executive Officer since August 2019. Before coming to Eos, Mr. Mastrangelo was president and chief executive officer of Gas Power Systems since September 2015. As an energy industry leader for the past two decades, Mr. Mastrangelo has extensive experience leading diverse teams to develop and deploy commercial scale projects around the world. Mr. Mastrangelo has broad operating experience across the energy value chain including serving as Chief Executive Officer of GE’s Power Conversion business, applying science and systems of power conversion to increase the efficiency of the world’s energy infrastructure. Mr. Mastrangelo spent ten years with GE Oil & Gas, in leadership roles in finance, quality, and commercial operations, culminating in being named a GE Corporate Officer in 2008. Joe began his career with GE in the company’s Financial Management Program and then joined GE’s Corporate Audit Staff. Originally from New York, Mr. Mastrangelo earned a Bachelor of Science in Finance from Clarkson University and an Associate of Science, Business Administration and Management from Westchester Community College. -
Jeff McNeilDirectorRead full bio
Jeff McNeil
Director
Jeff McNeil joined the board of directors in October 2023. Mr. McNeil is an experienced advisor, C-suite leader, and former Chief Operating Officer and brings over 40 years of engineering, manufacturing, supply chain, quality, customer service, executive management experience in the semiconductor, disk drive, and solar industries. He previously served as Chief Operating Officer and Executive Vice President of Enphase, a global energy management technology company that provides residential and commercial solar plus storage solutions. Prior to joining Enphase, McNeil spent 21 years at Cypress Semiconductor, where he served as Senior Vice President, Worldwide Operations responsible for manufacturing, planning, and logistics. Mr. McNeil is currently serving as a board member for Upstart Power, a residential fuel cell manufacturer. McNeil earned his B.S degree in chemical engineering from San Jose State University.
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Gregory NixonDirectorRead full bio
Gregory Nixon
Director
Greg Nixon is Head of Strategic Investments for Cerberus and joined the Eos Board in July 2024. In his role at Cerberus, he focuses on investment opportunities with the potential to drive technological, security, and defense advancements across sectors and geographies. Previously, Mr. Nixon served as managing director of Cerberus Operations and Advisory Company and has served on the Board of Directors for several Cerberus portfolio companies. Prior to rejoining Cerberus in 2021, Mr. Nixon served in a variety of senior executive roles leading significant global strategic and operational initiatives. His experience includes leadership roles at DynCorp International (a Cerberus portfolio company), CH2M Incorporated, McKinsey and Company, and Booz Allen Hamilton Inc. He also served as an executive advisor to Tracker Capital Management, a venture capital investor founded by Cerberus Co-Founder and Co-Chief Executive Officer Steve Feinberg that invests in high-potential technology growth companies. Prior to his career in the private sector, Mr. Nixon served in senior positions in the U.S. Department of Defense and the U.S. Government Accountability Office. His technology experience includes being a licensed patent attorney, serving as Special Intellectual Property counsel for the Defense Department, and being a commercial litigator at the international law firm of Howrey and Simon.
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Nick RobinsonDirectorRead full bio
Nick Robinson
Director
Nick Robinson is a Managing Director on the Supply Chain and Strategic Opportunities team of Cerberus Capital Management (“Cerberus”) and joined the board of directors in June 2024 . Mr. Robinson joined Cerberus in 2011, and his team invests in businesses driving next-generation technologies and capabilities that advance supply chain integrity. In his role, he leads investments across several industries and technologies. Mr. Robinson previously served as the Co-Chief Investment Officer of Cerberus Telecom Acquisition Corporation until the completion of its business combination with KORE Wireless in 2021. Prior to that, he served as Cerberus’ Head Trader. Mr. Robinson has led public and private deals within the areas of next generation communications, critical minerals, and grid security. He currently sits on the board of Torngat Metals, a private rare earths development company. Prior to joining Cerberus, Mr. Robinson was an Executive Director and credit trader on the high-yield and distressed desk at Morgan Stanley. He started his career in 2004 as a Credit Analyst in Goldman Sachs’ Leveraged Loan Group. Mr. Robinson graduated from Acadia University in Nova Scotia, Canada. -
Marian “Mimi” WaltersDirectorRead full bio
Marian “Mimi” Walters
Director
Marian “Mimi” Walters has served as a member of our board of directors since November 2020. Ms. Walters is Chief Commercial Officer for Leading Edge Power Solutions, LLC since November 2019. She is a former Member of the U.S. House of Representatives (the “House”) from California’s 45th District where she worked on key legislation, business and policy initiatives related to energy, technology, environmental and healthcare and served from 2015 to 2019. As a member of the leadership of the House, Ms. Walters served on the influential Energy and Commerce Committee, and was a member of the Communications and Technology, Digital Commerce and Consumer Protection, and Oversight and Investigations subcommittees. Prior to her election to the, Ms. Walters was a member of the California State Senate, from 2008 to 2012 in the 33rd district and from 2012 to 2015 in the 37th district, where she served on the Banking and Financial Institutions Committee and was Vice Chair of the Appropriations Committee. She previously served in the California State Assembly, and mayor and council member for the City of Laguna Niguel. Prior to her career in public service, Ms. Walters was an investment professional at Drexel Burnham Lambert and Kidder, Peabody & Co. She earned a B.A. in political science from the University of California, Los Angeles.
