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I am a psychiatrist and epidemiologist. I research the causes of mental health problems, and am particularly interested in the role of genetics, trauma, and cannabis use in causing psychotic illnesses. My research also focuses on the overlap between psychosis and post-traumatic stress disorder, driven by observations in my clinical work, where I provide psychological therapy for people with post-traumatic stress disorder.


  • 2014–present
    Professor of Psychiatric Epidemiology, University of Bristol
  • 2015–present
    Professor of Psychiatric Epidemiology, Cardiff University