Doctor Emmett Lathrop "Doc" Brown, Ph.D. is a fictional character and one of the lead characters in the Back to the Future motion picture 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. He is voiced by Dan Castellaneta in the animated series. The character's appearance and mannerisms are loosely inspired by Leopold Stokowski and Albert Einstein. In 2008, Dr. Emmett Brown was selected by Empire magazine as one of The 100 Greatest Movie Characters of All Time, ranking at #76.
The character was born in the early 1920s, although the animated series and novelization disagree as to the exact year. 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 dogs (Copernicus in 1955, and 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.
His character is one who can be can be absent-minded at times, and despite being seen around fictional Hill Valley, the setting for all three films, evidence in the three films indicates that he is regarded as strange, eccentric, or crazy. He often enunciates his words with wide-eyed expressions and broad gestures ("Great Scott!" being one of the character's well-known catchphrases), and tends to use large words or phrases over short ones: for instance, referring to a dance as a "rhythmic ceremonial ritual" in the first film. An article in the July/August 2010 online edition of Autism/Asperger's Digest cites the aforementioned eccentricities and speculates in a tongue-in-cheek manner that Doc may have Asperger's Syndrome.
The only friends the character is shown to have are Marty, and Marty's girlfriend, Jennifer. The films do not depict how Doc originally met Marty, however production notes and word from creators Bob Zemeckis and Bob Gale have stated that they met several years prior to the events of the first film when Doc went door to door in the neighborhood looking for students interested in being his part-time lab assistant.
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Links: Wikipedia: Doctor Emmett Brown Wiki: Back to the Future IMDb: Back to the Future