Vasilis Papastefanopoulos received his Ph.D. in Machine Learning from the Department of Mathematics, University of Patras, Greece, in 2025, and his M.Sc. in Machine Learning from University College London (UCL) in 2018, during which he conducted research at the Francis Crick Institute. He subsequently spent several years working as a machine learning engineer in London, collaborating with major retailers on predictive modelling and data-driven decision making. He currently works as a freelance research scientist and data science consultant. His research interests include unsupervised anomaly detection, explainable AI, causal reasoning, and time series forecasting.