Dr David Lee BSc PhD CertEd CPsychol AFBPsS CSci is a Chartered Psychologist and Chartered Scientist who has been teaching, researching, and disseminating findings from his own research into sleep and the psychobehavioural treatment of insomnia for the last twenty years.  He holds memberships with the World Sleep Society, the British Sleep Society, The Institute of Occupational Safety and Health, The British Association of Brain Injury Case Managers, The Vocational Rehabilitation Association and The British Psychological Society, where he also holds an Associate Fellowship.  Sleep Unlimited are supporters of the Institute of Registered Case Managers.

David has held various academic posts, but now works full-time as Clinical Director for Sleep Unlimited Ltd., a company specialising in the delivery of training of psychobehavioural treatment strategies for insomnia under the umbrella of the REST® programme and in the assessment and treatment of individuals with insomnia.

​The company is increasingly working with legal firms, case managers and multi-disciplinary teams; providing expert and treatment reports for people who have experienced head injuries, and clinical negligence casework.