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Prof. Dr. Sebastian Geiger has been the Professor for Sustainable Geoenergy at the Department of Geoscience and Engineering the Delft University of Technology since 2022. His research focuses on developing and applying agile workflows to tackle the multiple challenges inherent to characterising and modelling geologically complex, and often fractured, geoenergy reservoirs, across scales and simulating the wide range of fluid movements through them, focusing on hot water but also the movement of CO2 and hydrogen.

Before joining the Delft University of Technology, he worked for 16 years at Heriot-Watt University in Scotland where he held the Energi Simulation Chair for Fractured and Geothermal Reservoirs, was the Director of the Institute of Geoenergy Engineering, and was the Director of Research for the School of Energy, Geoscience, Infrastructure and Society.

Sebastian received a PhD degree in Computational Geology from ETH Zurich in 2004 and worked at ETH Zurich as a postdoctoral researcher. He holds an MSc degree in Hydrogeology from Oregon State University (2000) and a Vordiplom (equivalent to BSc degree) in Geology and Mineralogy from the University of Freiburg, Germany (1997). He joined Heriot-Watt University in 2006 as an Assistant Professor and was promoted to Associate Professor in 2009. In 2010, aged 36 years, he became a Full Professor and Energi Simulation Chair, making him the youngest-ever full professor at the Institute of Geoenergy Engineering (then Institute of Petroleum Engineering) and one of the youngest-ever full professors in engineering in the UK. 

Sebastian graduated over 30 PhD students, supervised over 100 MSc theses, and trained 12 postdoctoral researchers. He has published over 200 reviewed technical papers in conferences or peer-reviewed journals, and edited one book. 

In 2017 Sebastian received the Alfred Wegener Award from the European Association of Geoscientists and Engineers (EAGE) for his ground-breaking research into carbonate reservoir characterisation and simulation. In 2019 he was elected as a Fellow of the Energy Institute and in 2020 he was appointed as a Fellow of the Royal Society of Edinburgh, Scotland’s national academy of science and letters.

Sebastian is very active in professional societies such as EAGE, where he served on numerous committees and chaired workshops and conferences. He is also an instructor for HOT Engineering, is a Board Member for the Scottish Energy Forum, and a scientific advisor to NAGRA (Swiss National Cooperative for the Disposal of Radioactive Waste). Together with Dr Hadi Hajibeygi he created the Geoscience and Geoenergy Channel on YouTube, which broadcasts weekly webinars to over 2800 subscribers across the world.

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