Robert Graysmith (born Robert Gray Smith; September 17, 1942)[1] is an American true crime author and former cartoonist, known for authoring the 1986 book Zodiac, based on his work on the Zodiac Killer case.
Graysmith worked as a political cartoonist for the San Francisco Chronicle in 1969, when the Zodiac Killer case came to prominence.
He attempted to decode letters written by the killer and became obsessed with the case over the next 13 years.
He eventually gave up his career as a cartoonist to write five more books on high-profile crimes, one of which became the basis for the film Auto Focus (2002).
[1] The film Zodiac (2007), directed by David Fincher, was based on his books and featured Jake Gyllenhaal as Graysmith.