Chris von Csefalvay

Chris von Csefalvay is an AI researcher, engineer and author whose work spans language models, reinforcement learning and robotics. He is a Distinguished Engineer at HCLTech, working on AI for healthcare and life sciences, from adapting foundation models to developing medical imaging methods and simulation environments for robotic learning. He is particularly interested in how intelligent systems learn from experience and operate in the physical world.

He is the author of The Craft of Post-Training (No Starch Press, 2026) and Computational Modeling of Infectious Disease (Elsevier, 2023). His books connect mathematical foundations with working code and the engineering judgement it takes to put both to use. Alongside his research and writing, he develops tools for machine learning, imaging and simulation with a focus on clinical applications.

Educated at Oxford, Leiden and Cardiff, he is a Senior Member of IEEE and a Fellow of the Royal Society for Public Health. Away from his work, he enjoys classical music, Greek drama and the company of his golden retriever, Oliver (cover star of The Craft of Post-Training).