Gerasimos Avlonitis holds a degree in Chemical Engineering from National Technical University of Athens and an MSc in Petroleum Engineering from Imperial College, London. He started his professional career in the upstream sector of the hydrocarbon industry. Based in the UK, he worked in numerous oil and gas production optimization projects in Europe, Middle East and Latin America. Moving to the downstream sector of the industry, he joined the business development team of Prometheus Gas S.A., a joint company of Copelouzos Group and Gazprom in Greece, involved in gas and power projects.

In May 2002 he joined the Greek Regulatory Authority for Energy (RAE) as an energy expert, holding the position of Head of the Gas Department from 2005 until the end of 2012. Since 2013, he is an advisor to the management of the Hellenic Gas Transmission System Operator S.A. (DESFA) on regulatory affairs. He is also a visiting lecturer at the Master program of the University of Piraeus in Energy: Strategy, Law & Economics. He has delivered seminars and training courses in gas sector organization, gas pricing and TPA tariffs in Greece and several other countries in Europe and the Middle East.