Sherlock Holmes is a fictional detective created by author and physician Sir Arthur Conan Doyle. A London-based "consulting detective" whose abilities border on the fantastic, Holmes is famous for his astute logical reasoning, his ability to adopt almost any disguise, and his use of forensic science skills to solve difficult cases.
Doyle said that the character of Sherlock Holmes was inspired by Dr. Joseph Bell, for whom Doyle had worked as a clerk at the Royal Infirmary of Edinburgh. Like Holmes, Bell was noted for drawing large conclusions from the smallest observations.However, some years later Bell wrote in a letter to Conan Doyle: "you are yourself Sherlock Holmes and well you know it. Sir Henry Littlejohn, lecturer on Forensic Medicine and Public Health at the Royal College of Surgeons, is also cited as a source for Holmes. Littlejohn served as Police Surgeon and Medical Officer of Health of Edinburgh, providing for Doyle a link between medical investigation and the detection of crime.