Doctor Emmett Lathrop "Doc" Brown, Ph.D. is a fictional character and one of the lead characters in the Back to the Future film trilogy, in which he is the inventor of the first time machine, which he builds out of a DeLorean sports car. The character is memorably played by actor Christopher Lloyd in all three films, as well as in the live action sequences of the animated series.
The character was born in 1914 (as established in Back to the Future: The Game). He refers to himself as a "student of all sciences", and is shown to be a passionate inventor. Scientists are his role models, as evidenced by the names of his pet dog, whom he calls Copernicus in 1955, and his later dog, whom he calls Einstein in 1985, and the portraits of Isaac Newton, Benjamin Franklin, Thomas Edison, and Albert Einstein found in his laboratory (which were on a wall in his home in 1955), and his favourite author is Jules Verne. When looking through his ancestral history, he reveals to Marty that his family name was originally von Braun, indicating a German background (and possibly alluding to the real-life and contemporary rocket scientist Wernher von Braun, who was brought to America after the Second World War).
Source: Wikipedia, "Emmett Brown", available under the CC-BY-SA License.