He trained in psychiatry at the Bethlem and Maudsley Hospital, and also spent some time at Queen Square Institute of Neurology. During his training he undertook a diploma in Cognitive Behavioural Therapy (CBT), and completed his doctorate (MDRes) in research psychology - based on the assessment and psychosocial management of Parkinson’s patients with complex neuropsychiatric conditions.
He currently serves on the board of directors for the British Neuropsychiatric Association (BNPA), and has been a founding member of the Faculty of Neuropsychiatry Movement Disorders Working Group; advisor to the All-Party Parliamentary Group on the Management of the Neuropsychiatry of Parkinson’s; worked on the Clinical Advisory Panel of Parkinson’s UK; and was a member of the Movement Disorders Task Force on Rating Scales in ICBs.
He teaches nationally and internationally on many different areas of neuropsychiatry, and has published book chapters on neuropsychiatry/psychology, and general psychiatry. He has additional interests in factors such as the real-world validity of psychological tests of dysexecutive syndrome. He is involved with ongoing work on a large prospective studies of PD progression and how this impacts on personality and behaviour in Oxford; NIHR funded projects on the neuropsychiatry of the autoimmune encephalopathies, and a further trial in Depression in Traumatic Brain injury.
Kelly, M. J., Baig, F., Hu, M. T. M., & Okai, D. (2020). Spectrum of impulse control behaviours in Parkinson’s disease: pathophysiology and management. Journal of Neurology, Neurosurgery & Psychiatry. 91;703–711.
Baig, F., Kelly, M., Lawton, M., Ruffmann, C., Rolinski, M., Klein, JC., Barber, T., Lo C., Ben-Shlomo, Y., Okai, D., Hu, M. (2019) Impulse control disorders in Parkinson’s and RBD – a longitudinal study of severity. Neurology 93(7); e675-e687.
Al-Diwani, A., Handel, A., Townsend, L., Pollak, T., Leite, M.I., Harrison, P.J., Lennox, B.R., Okai, D., Manohar, S.G. and Irani, S.R. (2019). The psychopathology of NMDAR-antibody encephalitis in adults: a systematic review and phenotypic analysis of individual patient data. The Lancet Psychiatry. 6(3); 235-246
Evans, A., Okai, D., Weintraub, D, Voon., V., Krack, P., Lim, S., Sampaio, C., Rascol, O., Stebbins, G., Schrag, A., Goetz, C. (2019) Scales to assess impulsive and compulsive behaviours in Parkinson's disease: critique and recommendations. Movement Disorders
Baig, F., Lawton, M. A., Rolinski, M., Ruffmann, C., Klein, J. C., Nithi, K., Okai, D., & Hu, M. T. (2017). Personality and addictive behaviours in early Parkinson's disease and REM sleep behaviour disorder. Parkinsonism & Related Disorders. 37; 72-78.
Koychev, I., & Okai, D. (2017). Cognitive-behavioural therapy for non-motor symptoms of Parkinson's disease: a clinical review. Evidence-based mental health. 20(1);15-20.
Iyasere, O., Okai, D., & Brown, E. (2017). Cognitive function and advanced kidney disease: longitudinal trends and impact on decision-making. Clinical Kidney Journal. 10(1); 89-94.
Okai, D., Askey‐Jones, S., Mack, J., Martin, A., Chaudhuri, K. R., Samuel, M., ... & Brown, R. G. (2016). Parkinson's Impulse Control Scale for the Severity Rating of Impulse Control Behaviors in Parkinson's Disease: A Semistructured Clinical Assessment Tool. Movement disorders clinical practice. 3(5); 494-499.
Okai, D., & Price, J. R. (2016). Functional disorders and ‘medically unexplained physical symptoms’. Medicine, 44(12), 706-710.
Okai, D. (2016). Clinical assessment in old age psychiatry. Medicine, 44(11), 641-645.
Okai, D., Askey-Jones, S., Samuel, M., Brown, R., David, A. (2015) Predictors of Response to a Cognitive Behavioural Intervention for Impulse Control Behaviours in Parkinson’s disease. Movement Disorders. 30(5); 736-739.
Todorova,A., Martin, A., Okai, D., Samuel, M., Brown, R., David, A., Chaudhuri, C. (2013). Subcutaneous apomorphine and non-motor symptoms in Parkinson's disease. Movement Disorders. 28 (Suppl. 1); S133-134.
Okai, D., Askey-Jones, S., Samuel, M., O’Sullivan, S., Chaudhuri, R., Martin, A., Mack, J., Brown, R., David, A. (2013) An RCT of a Cognitive Behavioural Intervention for Impulse Control Behaviours in PD patients. Neurology. 80(9); 792-799.
Mack, J., Okai, D., Brown, R., Askey-Jones, S., Chaudhuri, R., Martin, A., Samuel, M., David, A. (2013) The Role of Self-Awareness and Cognitive Dysfunction in Parkinson’s disease with and without Impulse-Control Disorder. The Journal of Neuropsychiatry and Clinical Neurosciences. 25(2); 141-149.
Okai, D., Samuel, M., Jones S., Brown, R., David, A. (2011) Impulse Control Disorders in Parkinson’s disease: A Broader Conceptual Framework. European Journal of Neurology 18(12); 1379-1383.
Okai, D., Owen, G., McGuire, H., Singh, S., Churchill, R. Hotopf, M. (2007) Mental Capacity in Psychiatric Patients: A Systematic Review. British Journal of Psychiatry 191(4); 291-297.
Hotopf, M., Okai, D., Owen, G., Singh, S, Churchill, R. (2007). Mental Capacity: a systematic review of empirical research. Department of Health, UK.
Owen, G., Okai, D., Hotopf, M (2007) Mental Capacity. Psychiatry. 6(2); 69-72.