His research interests lie in understanding the brain and psychological processes driving mental health problems and their treatment, especially disrupted motivation in depression. He has published over 150 peer-reviewed papers and his recent research has been funded by Wellcome, the Leverhulme Trust and the Rosetrees Trust. He founded and directs two PhD schemes: the UCL-NIMH Joint Doctoral Training Program in Neuroscience; and the UCL Wellcome 4-year PhD Programme in Mental Health Science.