David is a GP and diagnoses and treats a wide variety of sleep disorders. He previously worked as a respiratory doctor in the NHS sleep clinic in the Bristol Royal Infirmary.

David teaches sleep medicine to GPs and other healthcare workers within the NHS and in private clinics.

He has previously managed a number of clinics with Médecins sans Frontiers and worked as the COVID-19 Programme Coordinator with the Wellcome Trust in Africa.

He is a member of the British Sleep Society.