Joseph Hayes is a UKRI Future Leaders Fellow at the Division of Psychiatry, UCL. He is an honorary consultant psychiatrist in Camden and Islington NHS Mental Health Trust and an honorary public health consultant at the Office for Health Improvement and Disparities. He is a Co-founder of juli Health. He studied medicine at the University of Bristol and trained in psychiatry in Oxford and North London. He has an MSc in epidemiology from the London School of Hygiene and Tropical Medicine and a PhD in psychiatric epidemiology. He is associate editor of the British Journal of Psychiatry and the International Journal of Bipolar Disorders. He is a founding member of the Royal College of Psychiatrists Sustainability Committee and sits on the Academy of Medical Royal Colleges Choosing Wisely Committee. He has been the recipient of a number of research awards from the Royal College of Psychiatrists and is invited to talk internationally. He has acted as a consultant for television programmes about mental health for the BBC and Channel 4. He sits on the World Economic Forum Global Future Council on Mental Health. His research focuses on the use of large electronic health record and register data to understand the aetiology, treatment and prognosis of severe mental illness (schizophrenia and bipolar disorder). Working in collaboration with researchers at the Alan Turing Institute, University of Oxford, London School of Hygiene and Tropical Medicine, Kings College London, University of Copenhagen, Karolinska Institute, KTH Royal Institute of Technology, Vanderbilt University, and the University of Hong Kong to develop predictive and causal inference machine learning models to improve mental health outcomes. His research is cited in international policy documents and treatment guidelines, including the World Health Organisation, National Institute for Health and Care Excellence and the American Psychiatric Association.