Doctor Hazel Claire Weekes MBE (11 April 1903 – 2 June 1990) was an Australian general practitioner and health writer; she also had an early career as a research scientist working in the field of comparative reproduction. Doctor Weekes is considered by many as the pioneer of modern anxiety treatment and has written several books on dealing with anxiety disorders. Many of today's self-help books on anxiety continue to cite her work. Weekes' early work on the subject of reproduction and placentation in reptiles is held in high regard and is often cited by researchers in the field.