clinical biologist clinical biologist a clinical biologist is a health professional such as a doctor of medicine, pharmacist, chemist or biologist that is specialized in clinical biology, a medical specialty derived from clinical pathology. the concept includes interventional biology, including assisted reproductive technology. these professionals follow a medical residency whose duration varies between countries (from 3 to 5 years). this term is frequently used in france, belgium and other countries in western europe, africa or asia.