Thomas began his academic career at University College London (UCL) medical school. After completing an undergraduate degree in Medical Sciences with Neuroscience, he enrolled on the UCL MBPhD programme, combining his PhD with clinical studies. He works in the theoretical neurobiology group, led by Professor Karl Friston, at the Wellcome Centre for Human Neuroimaging at the UCL Institute of Neurology. His research interests include active inference, computational neuropsychology, and the oculomotor system.