Adam Kościelniak is one of the most experienced financial and transaction advisors in Poland dealing with the area of ​​renewable energy. He has many years of experience in professional consulting, which he gained in international consulting companies from the so-called "Big Four". He supported clients in the areas of M&A transactions, obtaining bank financing, enterprise valuations and building financial models. 

Before founding A-RES, he was a Deputy Director in a so-called "Big Four" entity in a team specializing in renewable energy and infrastructure investments. During his career, he advised on financing and purchase/sale transactions of photovoltaic and wind farms for the amount of over PLN 4 billion and with a total capacity of over 1 GW. He helps clients not only in Poland but also in the region of Central and Eastern Europe, the Balkans and the Baltic States.

Currently, he is a PhD student at the University of International Business and Economics in Beijing (PRC) in the field of finance. He is also a graduate of the Warsaw School of Economics and the University of Lodz. He is finishing obtaining international financial and investment certificates: ACCA and CFA ESG Investing. He actively participates, including as a speaker, in events related to the energy industry, infrastructure and investments. He has also been an active stock market investor since 2011.