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 joining 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, structured, 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

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 17-year veteran of the solar industry and an early employee of SunEdison, Jason was most recently 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 300MW 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

Charlie leads acquisition activities in Japan. He sources new investment opportunities for GSSG Solar and has overseen the diligence of over 3.0 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 sourced and evaluated the preliminary financial, technical and strategic attractiveness of solar projects and led the acquisition of over 1 GW of project pipeline. He joined SunEdison in the distributed energy program and was an architect of SunEdison’s Channel Partner Program, which added 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


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. He has overseen the valuation of close to 3 GW of pipeline and manages the tax and debt structuring of each of the Company’s projects. 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.

Nina Van Tries


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.

Travis Bell

Investment Associate

Travis is involved in the entire investment lifecycle, from financial valuation to drafting definitive documents. Prior to joining GSSG, Travis worked as an M&A attorney for five years at SRS Acquiom, closing over $4 billion in private equity- and venture-backed M&A deals. Concurrently, he managed an inhouse alternative asset investment fund. Travis specialized in clean energy policy during law school and, while interning at the Colorado House of Representatives, helped craft both the Colorado RPS and the legislation that enabled community solar. More recently, he taught an MBA-level course in M&A finance at Golden Gate University in San Francisco. He holds a J.D. from the University of Colorado Law School and a B.S. from the University of Southern California’s Marshall School of Business, where he graduated cum laude and as a Rath Foundation Scholar.

Kara Zimmer

Senior Accountant

Kara’s responsibilities include financial reporting, cash flow management, expense analysis, compliance reporting, and audit and tax support all related to the financial health and strategy of GSSG. Prior to joining GSSG, Kara held various accounting roles. Most recently she was a General Accountant for a Denver-based oil and gas company. Kara earned her B.A., magna cum laude, from the University of Colorado, Boulder.


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, 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.

Hiroshi Shibuya

Director, Business Development

Shibuya is responsible for sourcing renewable energy acquisition targets in Japan, as well as managing both the due diligence and closing processes. Prior to joining GSSG, he has experience forming joint development agreements for mega solar projects in Japan with a multinational oil company and an international solar module manufacturing company. In addition to his mega solar experience, Shibuya worked for Mitsubishi-UFJ Securities Inc., where he was in Global Investment Banking Business Unit - Principal Investment Division, and responsible for managing and operating 3 funds: 1) a private equity fund; 2) a corporate recovery fund; and 3) a nonperforming loan fund. He also worked for PricewaterhouseCoopers Financial Advisory Service Inc., where he was responsible for M&A advisor, valuation and Investment fund advisor. He started his career at Fuji Bank Limited where he worked in the International Treasury and Foreign Exchange Division located in the corporate headquarters, and in the Kanda Branch. Shibuya holds a CPA in Washington, USA (No.27603) and earned a BA in Commerce from the University of Meiji in Tokyo.

Yoko Tajika

Project Manager

Yoko is responsible for overseeing project development, module design layout and construction of solar photovoltaic (PV) power plants. Her role involves managing the activities relating to these project stages, and ensuring the projects achieve quality, budget, and schedule performance metrics. Yoko brings 25 years of project management experience to this role. Prior to joining GSSG, she held a project management and structural engineering role where she managed the construction of a portfolio of rooftop solar installations in Japan. Previously, Yoko held various project management, structural and lead application engineering, and technical manager roles. She began her career in the structural design department with a general construction contractor. Yoko received a B.S. in architecture and holds a Master’s of Engineering degree in architecture. She is fluent in Japanese and English.

Katsumi Tanno

Project Manager

Katsumi is responsible for overseeing project development, module design layout and construction of solar photovoltaic (PV) power plants. 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. Most recently, Katsumi worked as a project manager with experience in sales, PV design and construction management of 5 solar projects in Japan.

Senior Manager, Asset Management

She manages current and future renewable energy project acquisition processes from initial diligence through closing, as well as the asset management activities during construction and operations of the projects. Prior to joining GSSG, she spent 13 years in the real estate investment industry with three international companies, where she held responsibilities including asset management, structuring, transaction management, reporting, accounting and compliance in addition to acquisition. In addition to her real estate experience, she has experience in property management, and forecasting, planning and accounting in the real estate investment department of a large international private equity fund. She holds an advanced certification from the Real Estate Securitization Association in Japan.

Yukiko Nagano

Associate of Asset Management

Yukiko manages current and future renewable energy project acquisition processes from initial diligence through closing, as well as the asset management activities during construction and operations of the projects. Prior to joining GSSG, Yukiko spent 8 years in the aerospace industry with Jamco Corporation, where she was responsible for marketing, pricing, and contractual alignment with customers. At Jamco, she worked in the overseas department where she was successful in establishing and managing relationships with international manufactures that led to increased annual sales. Yukiko received a bachelor’s degree in social sciences from Ritsumeican University in Kyoto, and studied international trade and marketing at Western Town College, Toronto. She is fluent in Japanese and English.