Warren Leon
Warren Leon, Executive Director

Tel: 978-317-4559

Email: WLeon@cleanegroup.org

Warren Leon is Executive Director of the Clean Energy States Alliance. He oversees the organization’s day-to-day operations and leads strategy development. He directs CESA’s RPS Collaborative. He has written and edited many reports for CESA, including Clean Energy Champions: The Importance of State Programs and Policies. Prior to working for CESA, Warren was Director of the Massachusetts Renewable Energy Trust, Executive Director of the Northeast Sustainable Energy Association, and Deputy Director for Programs at the Union of Concerned Scientists. He co-authored the influential book The Consumer's Guide to Effective Environmental Choices. He holds a Ph.D. from Harvard University.

Lewis Milford
Lewis Milford, CESA Founder and President, Clean Energy Group

Tel: 802.223.2554 x202

Email: LMilford@cleanegroup.org

Lewis Milford is president and founder of Clean Energy Group (CEG) and Clean Energy States Alliance (CESA), two national nonprofit organizations that work with state, federal, and international organizations to promote clean energy technology, policy, finance, and innovation. Mr. Milford is also a nonresident senior fellow at the Brookings Institution. He works with many public agencies and private investors in the United States and Europe that finance clean energy. Mr. Milford is frequently asked to appear as an expert panelist at energy conferences throughout the United States and Europe. His articles on clean energy have appeared in many print and online publications including The New York Times, The Boston Globe, The National Journal, The Huffington Post, and Renewable Energy World. Before founding these two organizations, he was Vice President of Conservation Law Foundation, New England’s leading environmental organization. Prior to that, he was a government prosecutor on the Love Canal hazardous waste case in New York and previously directed the Public Interest Law Clinic at American University Law School where he represented veterans on a range of legal issues, including gaining compensation for their harmful expose to Agent Orange and nuclear radiation. He has a J.D. from Georgetown University Law Center.

Maria Blais Costello
Maria Blais Costello, Manager of Program Administration

Tel: 802.223.2554 x203

Email: Maria@cleanegroup.org

Maria Blais Costello is Manager of Program Administration for Clean Energy Group (CEG) and CESA; she is responsible for managing grants and communications for CESA and CEG projects. Maria directs CESA's State Leadership in Clean Energy awards. Over the past 20 years, she has managed the development activities and special events for both organizations. She also serves as CEG's corporate secretary. Maria previously worked at Conservation Law Foundation, where she served as the office manager for the Vermont office. She graduated cum laude from the University of New Hampshire with a B.A. in Political Science and a minor in Economics.

Samantha Donalds
Samantha Donalds, Communications Coordinator

Tel: 802-223-2554 x204

Email: Sam@cleanegroup.org

Samantha serves as a Communications Coordinator for Clean Energy Group and Clean Energy States Alliance. She assists with member services, communications, and research. She also coordinates social media and serves as the webmaster for both organizations. Samantha previously worked as an administrator at Fairewinds Energy Education, a nuclear safety advocacy non-profit in Burlington, Vermont. She has also worked as a research assistant in the environmental studies department at Brown University, where she researched fisheries projects in West Africa and compiled historic climate and fisheries data from southern New England. Samantha graduated cum laude from Mount Holyoke College with a B.A. in Environmental Studies and a minor in French.

Nate Hausman
Nate Hausman, Project Director

Tel: 802-223-2554 x206

Email: Nate@cleanegroup.org

Nate Hausman is a Project Director for the Clean Energy States Alliance (CESA), where he works on solar policy issues. At CESA, Nate coordinates a multistate initiative to develop solar in locations that provide benefits to the grid. Nate has also managed CESA projects focused on reducing solar soft costs and helping states and municipalities ensure that distributed solar electricity remains consumer friendly and benefits low- and moderate-income households. He authored CESA’s A Homeowner’s Guide to Solar Financing: Leases, Loans, and PPAs and co-authored CESA’s State Solar Contract Disclosure Requirements and Consumer Protection for Community Solar: A Guide for States. In 2018, Nate was selected for Renewable Energy World’s Solar 40 Under 40 list, which recognizes solar energy professionals under the age of 40 who are “fearless challenging and changing traditional solar business models.” Nate currently sits on the board of several nonprofit organizations, including the Catamount Trail Association, Montpelier Alive, and Vermont Sustainable Jobs Fund. Nate is an attorney licensed to practice in Vermont. He holds a J.D. with a certificate in Environmental & Natural Resources Law from Lewis & Clark Law School and a B.A. from Colorado College.

Nicole Hernandez Hammer
Nicole Hernandez Hammer, Project Director

Email: Nicole@cleanegroup.org

Nicole Hernandez Hammer is a Project Director for the Clean Energy States Alliance, where she works on low and moderate income solar. Prior to this role, Nicole participated in CESA’s DOE Solar Energy Strategies grant as a consultant to the Rhode Island Office of Energy Resources, working primarily with community groups in the state. She is a well-known climate change expert, sea-level researcher, and environmental justice advocate. A Guatemalan immigrant, she has worked to address the disproportionate impacts of climate change on under-resourced communities across the US. She served as the climate science and community advocate at the Union of Concerned Scientists, as the Florida field manager for Moms Clean Air Force, and as an environmental blogger for Latina Lista. Before that, she was the assistant director of the Florida Center for Environmental Studies at Florida Atlantic University, and coordinated the Florida Climate Institute’s state university consortium. She co-authored a series of technical papers on sea level rise projections, impacts, and preparedness. Her activism and initiative on climate change earned her an invitation from First Lady Michelle Obama, to be her special guest at the 2015 State of the Union address.

Ludovica Mastrobuono Brown
Ludovica Mastrobuono Brown, Legal Intern

Email: ludo@cleanegroup.org

Ludovica Mastrobuono Brown is CESA's Fall 2019 legal intern. Ludo has a summa cum laude J.D. from Vatican City, a Masters in Business Law, and an LL.M. from Vermont Law School. She also worked for the United Nations Model for young aspiring ambassadors, and for a Swedish international company which focuses on paper recycling. This fall, Ludo will be working with CESA on a wide variety of topic areas, including energy storage, hydro in renewable portfolio standards, renewable heating and cooling, and low-income solar. 

Meghan Monahan
Meghan Monahan, Office Manager

Tel: 802.223.2554 x201

Email: Meghan@cleanegroup.org

Meghan Monahan is CEG's Executive Assistant and Office Manager. She also serves as a project assistant for CESA. Her duties include managing staff schedules, administrative support, research, and event planning. Meghan is a magna cum laude graduate of Champlain College, where she majored in Business Administration.

Todd Olinsky-Paul
Todd Olinsky-Paul, Project Director

Tel: 802-223-2554 x 207

Email: Todd@cleanegroup.org

As project director for Clean Energy Group and Clean Energy States Alliance (CESA), Todd Olinsky-Paul directs the Energy Storage and Technology Advancement Partnership (ESTAP) project, a federal-state funding and information sharing project that aims to accelerate the deployment of electrical energy storage technologies in the United States. Mr. Olinsky-Paul also works on resilient power in the areas of combined-heat-and-power (CHP) and critical infrastructure energy resiliency.Todd joined CESA from the Pace Energy and Climate Center, where he served as the Manager of Communications, Education, and Outreach, as well as an Energy Policy Analyst. His recent work has focused on energy storage technologies and policy, renewable thermal generation and siting issues, renewable energy and grid interactions, financing and policy incentives, and emerging technologies. He has authored numerous reports for state and federal agencies. Mr. Olinsky-Paul has a Master of Science in Environmental Policy from Bard College and a Bachelor of Arts from Brown University.

Robert Sanders
Robert Sanders, Senior Finance Director

Tel: (215) 870-3257

Email: RSanders@cleanegroup.org

With over twenty-five years of experience in community development and energy-related commercial finance, Rob Sanders has deep expertise in designing, implementing and evaluating financing programs, financial products and related services in the areas of clean energy and sustainable community development. As senior finance director for Clean Energy Group, Mr. Sanders has written extensively about clean energy finance and resilient power, especially in connection with economically disadvantaged communities. Mr. Sanders was formerly the Managing Director of Energy Finance for The Reinvestment Fund, a leading innovator in the financing of neighborhood and economic revitalization. In this capacity, he served as Fund Manager for the Sustainable Development Fund, a $32 million fund created by the Pennsylvania PUC to promote renewable energy and energy efficiency, as well as TRF Fund Manager for the Pennsylvania Green Energy Loan Fund and the Philadelphia metropolitan area EnergyWorks Loan Fund. As lead for all energy investing, he made loans, leases, equity investments and performance-based grant incentives. Mr. Sanders holds an MCP from the University of California at Berkeley and a BA from Stanford University.

Laura Schieb
Laura Schieb, Program Associate

Tel: 802-223-2554 x209

Email: laura@cleanegroup.org

Laura Schieb is a Program Associate for the Clean Energy States Alliance, where she works on initiatives to make solar more accessible to low- and moderate-income communities. Laura was previously a Global Energy Fellow at Vermont Law School where she worked in the Institute for Energy and the Environment as a team leader in identifying strategies to overcome barriers to low-income solar ownership in Vermont. Laura received an LL.M. in Energy Law and a J.D. from Vermont Law School. Additionally, Laura has earned a bachelor’s degree in political science and a master’s degree in educational studies from the University of Michigan. She also holds a master’s degree in international policy studies from Middlebury Institute of International Studies in Monterey, California.

Val Stori
Val Stori, Project Director

Tel: 802-223-2554 x211

Email: Val@cleanegroup.org

Val Stori is a Project Director for the Clean Energy States Alliance, where she leads projects focused on building electrification and offshore wind Policy. She coordinates a multi-state initiative to develop renewable heating and cooling tools that support and accelerate the deployment of renewable heating and cooling technologies. Additionally, she co-directs CESA’s offshore wind project, which is focused on regional state cooperation to decrease costs and accelerate market growth. She has also managed projects focused on stakeholder outreach, small wind turbines, bioenergy, and biomass thermal. She currently coordinates working groups on renewable thermal and bioenergy. She has co-authored several reports, including Case Studies of RPS Best Practices: Solar Carve-outs, SREC Tracking, and Thermal Inclusion; Distributed Wind Energy Zoning and Permitting: A Toolkit for Local Governments; and Environmental Rules for Hydropower in State Renewable Portfolio Standards. She currently sits on the board of several non-profits, including the Friends of Nepal, and sits on the Town of Underhill’s Planning Commission. She holds a B.A. from Middlebury College and a Master of Studies in Environmental Law from the Vermont Law School.

Georgena Terry
Georgena Terry, Volunteer Research Associate

Email: gterry@cleanegroup.org

Georgena Terry is a volunteer research associate for the Clean Energy States Alliance (CESA). She is the founder of Terry Precision Bicycles for Women. Her interest in environmental issues arose from many miles on a bicycle, following roads along marshes and grasslands and through forests. This burgeoning passion eventually led her to Vermont Law School, where she earned a Master of Environmental Law and Policy. She also has a Bachelor of Science in Mechanical Engineering from Carnegie-Mellon University and an M.B.A. from the Wharton School. As a volunteer, she hopes to help CESA advance its clean energy mission.

Anthony Vargo
Anthony Vargo, Chief Financial Officer

Tel: 802-223-2554 x214

Email: Tony@cleanegroup.org

Tony Vargo serves as CFO for CEG and CESA, where his primary responsibilities include budgeting, financial accounting, external reporting/audit, and grant reporting. In addition, he works with staff in human resource management and benefits design/administration. Previously, he served as a VP/CFO/Treasurer with the National Gardening Association. He is a CPA CGMA with 25 years of experience in financial management.

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