A fellowship for a doctor is a period of additional, optional training in a subspecialty of medicine that a physician can undertake after completing medical school and residency. During this training, the physician is known as a fellow. The purpose of a medical fellowship is to become a specialist in a chosen field of medicine by working closely with a specialist to deepen their experience and knowledge of their subspecialty. The specialist will be an expert and leader in their field. After completing a fellowship program, a physician earns the title "fellowship-trained," representing the highest dedication to their field. Fellowship-trained doctors are specialists in their field and are highly sought after. Fellows are well respected amongst doctors and patients and are sure to be experts in their chosen subspecialty.