Luke is a research associate in the NIHR Mental Health Policy Research Unit in the Division of Psychiatry, UCL. Before this, he was the trial manager of CIRCLE, a large randomised controlled trial of a contingency management intervention for helping Early Intervention in Psychosis service users quit cannabis use. He is currently completing his doctoral thesis, which is investigating the cognitive-behavioural mechanism underlying the CIRCLE intervention and quitting cannabis in psychosis. His interests include mental health policy, psychotic illness, and evidence based treatment for substance misuse in severe mental illness. His first degree was in philosophy before he moved into mental health research. He is interested in the philosophy of mental illness.