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Gareth Penn Writer

Gareth Sewell Penn (born 1941) is an American true crime author and amateur detective known for being among the first non-journalists to write about the Zodiac Killer case. He published a theory about the killer's motives, publicly accused a noted UC Berkeley public policy professor of the crimes, and labeled himself a one-time suspect. Reviewing the 2007 David Fincher film Zodiac for the Las Vegas Weekly, Mike D'Angelo wrote, "I think the movie erred in selecting author Robert Graysmith as its source and nominal protagonist. Zodiac buffs know well that the true obsessive is a fellow named Gareth Penn."