Investment Team


Tomakin Archambault

Managing Director and CEO

Tomakin oversees the strategic direction and financial performance of GSSG Solar and its investments. Tomakin plays a key role in fundraising efforts and is involved in the structuring of all GSSG transactions. Before founding GSSG Solar, Tomakin was the VP of Finance & Investment and co-head of the Global Special Situations Group at SunEdison and oversaw the execution of several creative financing structures. Previously, he was an original member of a wind and solar investment platform at a private investment fund where he originated, structure, and invested in solar portfolios across the U.S. Earlier in his career, he consulted at the Rocky Mountain Institute. Tomakin received his B.S. in mechanical engineering with honors from University of Denver and his M.S. in civil engineering from Stanford University.

Jason Stevens

Managing Director,
Technical Operations

Jason oversees technical activities and operations at GSSG Solar, including the technical diligence of potential transactions and is a member of the company’s investment committee. Jason is involved in assessing the technical and operational viability of all solar assets at GSSG Solar to ensure they meet all requirements for investment. A veteran of the solar industry since 2001 and an early employee of SunEdison, prior to his role as a co-founder at GSSG Solar, Jason was the Managing Director of Operations within the Global Special Situations Group. Previously, Jason was the VP of Engineering. Procurement & Construction (EPC) for SunEdison where he led a several hundred person team responsible for the development, design, permitting, and construction of over 300 MW of solar projects across a variety of applications, customers, and geographies. Prior to SunEdison, Jason worked in BP’s solar division in both a business and product development role. He has evaluated technical feasibility, operational optimization, and the resulting financial impacts across a wide range of solar project technologies. He received his B.S. in mechanical engineering from Virginia Polytechnic Institute (VA Tech) and an MBA from University of Texas, Austin.

Charlie McDaniel

Managing Director, Origination

Charlie leads origination and acquisition activities. As a co-founder at GSSG Solar, he sources new investment opportunities for GSSG Solar and has overseen the diligence of over 4.0 GW of utility-scale opportunities in Japan. Charlie spent 5 years at SunEdison where he was most recently a Director of M&A within the Global Special Situations Group where he sources and evaluated the preliminary financial, technical and strategic attractiveness of solar projects and led the acquisition of over 2 GW of project pipeline. He joined SunEdison in the distributed energy program and was an architect of SunEdison’s Channel Partner Program, which asses over 100 MW of projects in the commercial sector. Prior to SunEdison, Charlie was an FP&A analyst at Mervyn’s department store, where he developed the solar program for their store rooftops. Charlie earned his B.A. from Truman State University and was a member of the collegiate soccer team. Charlie also holds an MBA from the University of San Francisco.

Adrian Archambault

Director, Valuation

Adrian manages the valuation team at GSSG that develops and audits the financial models used in structuring and valuation for each GSSG project and portfolio. Since joining as a co-founder in 2013, he has overseen the valuation of over 4 GW of pipeline and manages the tax and debt structuring of each of the Company’s projects (including successful duct syndication in both Mexico and Japan). He also performs most of the policy research in both the U.S. and Japanese markets. Adrian graduated phi beta kappa from Stanford University with a degree in earth systems and a minor in economics. He was the Lorry I. Lokey intern at Environmental Defense Fund and conducted carbon cycle research on the remote Pacific Island of Palmyra Atoll.


Director of Investor Relations

David oversees the fundraising & investor relations functions at GSSG Solar. He is an experienced private markets professional with two decades of buy and sell side expertise. Most recently he spent six years at Kerogen Capital managing investor relations & fundraising and prior to that spent eight of the previous twelve years as a Senior Portfolio Manager at Colorado PERA, a $45 billion public pension plan, where he oversaw a $4.6 billion global portfolio (invested and committed capital) of private equity, natural resource, venture capital, distressed debt and mezzanine investments. He was an active participant on numerous partnership Advisory Boards and was an observer to the Board of Directors for several co-investments. Prior to joining Kerogen, David worked at Forbes Private Capital Group in origination, project management and distribution capacities. David graduated with a B.S. and a M.B.A. from the University of Colorado at Boulder and is a Chartered Financial Analyst.


Investment Manager

Brandon joined GSSG Solar to manage the origination, development, and financing of the Company’s U.S. solar project investment activity, primarily in New Hampshire. He has spent the last nine years in consulting, investment, and development in the energy space. His experience includes production analysis for upstream Oil and Gas and financial modeling for a portfolio of energy companies for a venture capital firm. Most recently, he was responsible for the budget formation, financial analysis, project development, and contract negotiation for a portfolio of energy storage projects at RES Americas, growing their constructed projects from 8 MW to 280 MW in 5 years. Brandon earned his BSBA at the University of Colorado and holds a PMP certification.

Nina Peranni

Controller & Compliance

Nina manages the corporate finance activities of GSSG and its affiliates, including tax, accounting and compliance matters. For over a decade, she has actively worked in accounting and tax roles providing leadership and strategic direction on financial operations. Prior to joining GSSG, she held lead accounting positions with private investment firms managing diversified portfolios in the energy and real estate markets. Nina holds a BBA in Finance from the University of North Texas and a Masters in Accountancy from Texas State University.


Office Manager

Courtney leads office operations and offers administrative support to the entire global team. Prior to joining GSSG, she worked and specialized in the hospitality industry for 11 years. Courtney received her B.A. in Psychology from the University of Colorado at Boulder and works part-time as a paleontology preparator volunteer at the Denver Museum of Nature and Science.


Yoshiyasu Sumi

Country Manager &
Director of Asset Management

Sumi manages GSSG’s Tokyo office and has developed the local asset management capabilities of the company in Japan. Prior to joining GSSG as Country Manager in 2016 (he started consulting for GSSG in 2014), he spent 6 years at Octave Japan KK and lead asset management, structuring, transaction management, reporting, accounting and compliance as an Executive Director. He worked on various transactions, including asset management of a loan portfolio for a major U.S. real estate fund ($1.0+ billion enterprise value), asset management of a European-based real estate fund, and the project development and asset management activities for two international solar investment funds. Previously, Sumi worked at Capmark Japan KK where he oversaw secondary market transactions, loan pricing on over 15 real estate backed syndication/securitization transactions and was responsible for working out defaulted real estate debt, developing pricing models, and implementing an in-house accounting management system. He started his career as a financial analyst at Hitachi Chemical and obtained a B.A. in economics from Keio University in Tokyo. Sumi is fluent in Japanese and English.

Toshimichi Wago

Director, Asset Management

Toshi manages the asset management team in Japan including technical operations. He leads all aspects of EPC, O&M, design, construction management, asset management, reporting from initial investment through to operations. He works to establish cross-functional, cross-disciplinary solutions for GSSG’s projects. Toshi brings nearly 20 years of engineering and project management experience to GSSG. Prior to joining GSSG, Toshi worked for Schlumberger Technology Corporation in both the USA and Japan. He held roles at Schlumberger ranging from design engineering to project management, where he most recently was a project manager in the Schlumberger’s Acoustics R&D department and lead multicultural and multidisciplinary teams of up to 20 engineers in Tokyo. Toshi received a B.S. in electrical engineering from Pontificia Universidad Javeriana (Colombia) and a M.S. in mechanical engineering from Rice University. Toshi is a native Spanish speaker and is fluent in both Japanese and English.

Koji Shiga

Director, Project Development

Koji manages the project development team in Japan. He is responsible for all development activities including permitting, interconnection, site control, and local stakeholder management. Koji has over 10 years of international asset management and accounting experience prior to joining GSSG including experience at a Tokyo-based renewable energy firm where he managed the day-to-day operations of solar projects and supported the project financing process. Koji graduated a bachelor of business accounting at University of Western Sydney (Australia). Koji holds a CPA Australia. He is fluent in both Japanese and English.


Director, Project Finance

Satoshi is responsible for sourcing and structuring project debt for GSSG’s portfolio of projects. As a seasoned veteran of the finance industry, he started at Nomura Real Estate and has since spent over 20 years in New York and Tokyo structuring ABS, originating CMBS and investing in various types of asset-backed loans and securities. For each assignment, he worked at, respectively, Citibank, Capmark Japan and Shinsei Bank where he also provided financing himself to renewable energy projects immediately prior to joining GSSG. Satoshi received a B.A. in economics from Waseda University and a MBA from Simon Business School at University of Rochester. He is a native speaker of Japanese and fluent in English.

Katsumi Tanno

Project Manager, Asset Management

Katsumi is responsible for overseeing project development, module design layout and construction of solar photovoltaic (PV) power plants in Japan. His role involves managing the activities relating to these project stages, and ensuring the projects achieve quality, budget, and schedule performance metrics. He started his career managing telecommunication construction projects with a focus on quality control, safety and schedule management. Prior to joining GSSG in 2018, Katsumi worked as a project manager with experience in sales, PV design and construction management of 5 solar projects in Japan.


Project Manager, Asset Management

Osamu manages current and future renewable energy project asset management activities during construction and operations in Japan. Prior to joining GSSG, he worked for TRN Investment management where he played a key role in fundraising and asset management efforts as an Executive Director. Osamu has over 20 years of both asset and project management and architectural design experience prior to joining GSSG. His prior experience includes managing commercial and residential real estate investments throughout Japan and nearly a decade at an architectural design firm. Osamu received a bachelor’s degree in Environmental design and Education from Iwate University. He has an Architect license (1st grade).

Takashi Ikeda

Project Manager

Takashi manages project development activities in Japan. He supports all development activities including permitting, interconnection, site control, and local stakeholder management. Prior to joining GSSG, he worked for several renewable energy companies primarily focused on project due diligence and development. He received a bachelor’s degree in Psychology from Aoyama Gakuin University (Japan).

Hidemitsu Arai

Project Manager, Project Development

Hidemitsu manages project development activities in Japan. He supports all development activities including permitting, interconnection, site control, and local stakeholder management through the start of construction. He has been in the solar industry since 2010 as CFO of a racking manufacturer and as head of M&A for a module manufacturer and has overseen the development activities of various projects. Prior to renewables, he managed a science museum, and supervised the accounting systems, business planning and finance departments within a chain of restaurants. As CFO of an IT company, Hidemitsu directed various M&A operations. Hidemitsu majored in economics at Ryutsu Keizai University and holds a masters in accounting from Waseda University.

Kim Myeonggu

Project Manager, Development

Kim manages project development activities in Japan. He supports all development activities including permitting, interconnection, site control, and local stakeholder management through the start of construction. He has been working in solar project development and asset management for 10 years. Before working in the renewable energy field, Kim engaged in bond investment sourcing and due diligence for business revitalization at Shinsei Bank Principal Investment division. Prior to Shinsei Bank, he worked in Lasalle Investment Management in both asset and project management roles for commercial facilities and distribution warehouses. Kim received a bachelor’s degree from the Marshall School of Business at the University of Southern California.

Shinobu Yoshitomi

Director, Public Relations

Shinobu manages Public Relations and Government Relations activities for our Japan office. She is an experienced coordinator for complex working environments and projects and has extensive experience facilitating international business, trade, culture and education relations in Japan and U.S. She served as Executive Director for Japan America Society of Colorado for 6 years in the U.S. and was involved in variety business, cultural and educational programs working with both public and private sectors. She also served as General Manager, Consumer Affairs, Research & Communications for the U.S. Meat Export Federation for 5 years in Japan—responsible for marketing, advertising, PR programs, research projects, and other consumer related projects to promote U.S. meat industry. She received a bachelor’s degree in Political Science from University of Colorado, Boulder. Shinobu is fluent in both Japanese and English.

Tomoko Ogasawara

Accounting Manager

Tomoko manages accounting activities of GSSG Solar Japan, and its affiliates in Japan. She has worked in foreign affiliated companies in Japan all the time. She brings experience in Accounting and FP&A along with USGAAP and JapanGAAP. Prior to joining GSSG, she worked as finance controller with solar power businesses and accounting manager for insurance businesses. Tomoko earned an associate degree in Business from Otaru University of Commerce and a B.A. in Economics from Hokkaigakuen University.

Minami Yoshii

Office Manager, Tokyo

Minami is responsible for the full range of office operations and administrative functions in our Tokyo office. Minami brings over 15 years of hospitality and office management experience and has lived in both the USA and Japan. She is fluent in both Japanese and English, and designs jewelry in her free time.

Kevin Yang

Investment Associate & Director of Project Development (Taiwan)

Kevin manages the Taipei office and is tasked with developing solar projects in Taiwan and Korea. Before joining GSSG, he worked for DuPont Group and Trina Solar over the past 12 years in sales and development roles. He manages the entire development process, from site selection to construction. He started his career as a sales manager at Japanese Trading Enterprise and obtained an LL.B. in Law from National Kobe University in Kobe Japan. Kevin is fluent in Japanese, Korean, Chinese, and English.

Vincent Chen

Investment Associate

Vincent leads project finance, project development, and policy research for GSSG’s Taiwan portfolio. Vincent brings a diverse set of experience in business development, financial planning, and research in sustainable development and climate resilience to this role. Prior to joining GSSG, Vincent was the senior business development manager at Jupiter Intelligence, a climate risk analytics firm, where he led the development of the company’s strategy in the utility, industrial, financial, and pharmaceutical sectors. He also led the development of Lucid Motors’ vehicle grid integration plans to enable more flexible use of electric vehicle batteries as a grid resource. Vincent received his master’s and bachelor’s degree with honors from Stanford University, where he focused his studies on environmental economics, renewable energy, and climate policy. A Taiwan native, Vincent is fluent in English, Taiwanese, and Chinese.