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Meet our Board

Mark Lewis

Managing Director, Lime Rock New Energy

Mark Lewis is a Managing Director with responsibility for investment sourcing, execution, and overall fund management. He currently serves on the boards of directors of Electric Power Engineers, ENER-I.ai, and Power TakeOff, and is a board observer at Aperia Technologies. Mark joined Lime Rock New Energy in 2018 and brings to this role a career in clean and renewable energy portfolio company management and operations, energy transition investing, and strategic energy technology acquisitions. 

Prior to joining LRNE, Mark served as President of TAE Technologies, Inc., a leading fusion energy technology development company. Previously, Mark served as CEO of ONEnergy, Inc., a diversified energy services company involved in energy retailing, commercial and industrial energy efficiency and distributed solar development. Prior to ONEnergy, Mark was an investor and a Managing Director and Co-Chair of the Investment Committee at MissionPoint Capital Partners, an environmentally driven investment firm focused on financing the transition to a lower carbon economy. Earlier in his career, Mark served with General Electric in Europe and the US, including three years as the head of Global Business Development at GE Power (now GE Vernova). He was involved in over $15 billion of transactions during his career at GE.  Mark started his career in energy investment banking at Credit Suisse in New York and London. He previously served on the boards of directors of Qmerit, Smart Wires, Trilliant Networks, UpWind Solutions, ONEnergy, and OZZ Clean Energy.


Mark is a graduate of Western University (B.A.) and the Kellogg School of Management at Northwestern University (M.B.A.).

Blair Barlow

Managing Director, Lime Rock New Energy

Blair Barlow joined the Lime Rock New Energy team in 2021 as a Director and is now a Managing Director. Prior to joining Lime Rock New Energy, Blair spent 13 years on the Lime Rock Partners team where he gained increasing deal management responsibilities, rising from the level of Associate. He brings to the team diverse deal selection, execution, and portfolio company strategic execution experience and has played a leadership role in global field service, product, and technology-oriented companies in the Lime Rock Partners portfolio. Blair has worked for Lime Rock in multiple domestic and international locations. Blair currently serves on the board of directors of Aperia Technologies and Power TakeOff, and previously served on the board of directors of Ardyne, Capstone Natural Resources II, Cor4 Oil, Prime Rock Resources, Reveal Energy Services, Rod and Tubing Services, and Transform Exploration. He is a graduate of Harvard University (A.B.).

Radhika Shroff

Managing Director, Private Equity Impact Investing, Nuveen

Radhika is a managing director on the Private Equity Impact Team at Nuveen and is responsible for identifying, executing and managing direct private equity investments in key thematic impact sectors in both developed and developing markets.

Prior to joining the firm in January 2020, Radhika was the Deputy Chief Investment Officer of Accion Global Investments, responsible for leading global equity investments and managing a portfolio of equity investments in over 20 financial institutions and innovative financial services providers that support underserved populations in emerging markets. Before Accion, she spent 15 years in various investment, advisory and operational roles including Latin America investment banking, global consumer and commercial banking and microfinance principal investing at financial services institutions including UBS, Citi, Wells Fargo and Peruvian Development Group.

Radhika graduated with a B.S. in Economics and a B.A. in Psychology from The University of Pennsylvania, an M.B.A. from The Wharton School and an M.A. in International Studies, with a concentration in Latin America, from The Lauder Institute and she is a former Luce Scholar with the Thai Ministry of Finance. Radhika sits on the board of Yuva Pragati, a non-profit focused on child health and wellness in rural India and is fluent in Spanish and Gujarati.

Dr. Michael Howard

CEO Emeritus, Electric Power Research Institute
Chair, World Energy Council

Dr. Michael W. Howard is passionate about creating a sustainable and equitable energy future. He combines business insight with deep technical expertise and in-depth electric utility experience. He has over forty years of results-driven global executive experience with a bias toward collaboration, entrepreneurship, and innovation in organizations ranging from start-ups to large public companies. Most recently, Dr. Howard served for ten years as the CEO of EPRI, a $460 million company headquartered in Palo Alto, California, with several U.S. and international offices.

EPRI develops technology innovations encompassing the production, delivery, and use of electricity, including nuclear power, renewable energy, energy storage, and electric vehicles, with a mission to ensure reliable, affordable, and cleaner electricity for society. Dr. Howard served in several EPRI leadership roles before EPRI’s Board of Directors selected him as its President and CEO in 2010. He retired as  CEO at the end of 2020, and the Board of Directors appointed Dr. Howard as its CEO Emeritus.

Dr. Howard serves on the Board of Directors of three technology-based companies who provide products and services to the energy sector. He also serves on the Carnegie Mellon University’s Scott Institute advisory council and is Chair of the World Energy Council headquartered in London. Dr. Howard recently served on a technical committee of the U.S. National Academies of Sciences. Dr. Howard was awarded the Distinguished Energy Award in Washington, D.C., for lifetime contributions to providing technical innovations and leadership to global energy issues. Dr. Howard is an active IEEE and National Association of Corporate Directors member.

Dr. Howard started his career with Westinghouse after receiving his B.S. in Electrical Engineering from The University of Tennessee. While working at Westinghouse, he received his M.S. in Business and Engineering from the University of Pittsburgh, and his Ph.D. from The University of Tennessee, College of Engineering.

Carrie Zalewski

Vice President, Markets & Transmission, American Clean Power

Carrie is the Vice President of Transmission and Electricity Markets at the American Clean Power, Association where she advances clean energy through policies that ensure fair access to the electricity market.

Previously, Carrie served as the Chair and Agency Head of the Illinois Public Utility Commission, where she brought her expertise as an energy attorney, engineering degree and over 15 years of experience in Environmental and Energy Regulation.  She oversaw an agency of over 200 employees, consistently delivering balanced budgets and strong results leading the Commission through the first round of implementation of the Climate and Equitable Jobs Act.

Carrie was the founding Chair of NARUC’s Chair Council bringing together Commission Chairs from all 50 states to discuss timely topics.  She served on the Board of Directors for the Organization of MISO States (2020-2022) and on the Board of the Organization of PJM States (2023).

Carrie has been tapped by both Democratic and Republican administrations to serve in a variety of roles and take on increasingly challenging positions.  She is a frequent speaker and participant in discussions in the energy and regulatory space.  Carrie is currently an adjunct professor, teaching “Clean Energy Law” at the Northwestern Pritzker School of Law.

Kevin Martin

Co-CEO & Chief Operations Officer, Power TakeOff

Kevin Martin is a results-driven executive with over 15 years of experience in the software and energy efficiency services industry. Kevin serves as co-CEO and COO of Power TakeOff, a leading company in the energy efficiency and sustainability sector. In this position, Kevin plays a pivotal role in steering the organization towards its mission of driving positive environmental impact while ensuring operational excellence. Kevin is a graduate from the University of Waterloo (B.E.S.) and prior to joining Power TakeOff worked in various roles in home energy efficiency, ground water remediation, and municipal organics waste management. 

Peter Widmer

Co-CEO & Chief Business Officer, Power TakeOff

Peter Widmer is a dynamic leader in the energy industry where his leadership at Power TakeOff as Co-CEO and Chief Business Officer has brought innovation and cutting-edge services to underserved small and midsize businesses across the United States. In his industry facing role, Power TakeOff has become a trailblazer in sustainable energy solutions within the utility demand side management market where the company is a trusted partner to dozens of investor-owned utilities. Prior to joining Power TakeOff, Peter began his career in resource conversation through carbon credit project development in East Africa and at FERC’s Office of Energy Market Regulation. Peter graduated with a B.A. in Business from Goshen College and an M.B.A. from George Washington University.