Professor Delpy originally studied physics and after two years in industry, spent 35 years at University College London (UCL) developing techniques for monitoring newborn infants. He is best known for developments of NIR Spectroscopy and Imaging of brain oxygenation. Many companies have marketed devices developed by him and his team. After seven years as Research Vice Provost, he left UCL in 2007 to become the CEO of the EPSRC, stepping down in 2014. He was then Chair of the Defence Scientific Advisory Council from 2014 to 2017 and is currently Chair of the Strategic Advisory Board for the UK National Quantum Technologies Programme and Emeritus Professor of Biomedical Optics at UCL. He is a Fellow of the Royal Society, the Royal Academy of Engineering, and the Academy of Medical Sciences.