Leonard H. McCoy

"You're an old fashioned boy, McCoy."
– James T. Kirk, 2267

Leonard H. McCoy, MD was a noted physician and scientist of the 23rd and 24th centuries. McCoy was an accomplished surgeon, physician, psychologist, and exobiologist, and was also considered an expert in space psychology. As ship's surgeon and chief medical officer, he served aboard the USS Enterprise and USS Enterprise-A for a combined twenty-seven years.

Dr. McCoy was born in the "Old South" region of North America on Earth in 2227 and began studying medicine in or before 2245. McCoy's graduation date from medical school is never confirmed in a Star Trek production, but with four years of pre-med followed by four years of medical school, McCoy would normally have received his medical degree in 2253, assuming he started college at the age of eighteen in 2245. Kirk's statement in 2270 that McCoy had spent "25 years in medicine" seems to support this.