Science fiction author Philip K. Dick died in 1983 at 53 years old. His cultural influence is everywhere, from box office hits like “Minority Report,” to the novels of the late David Foster Wallace. His dark, twisted stories about drugs, psychological disorders, and government conspiracies have won awards and left an impression on the science fiction landscape. While Philip K. Dick fan clubs have long been part of the literary landscape, one of the novelist’s biggest fans is famed author Jonathan Lethem. Lethem has co-edited of “The Exegesis of Philip K. Dick,” a sprawling collection of Dick’s notes, journal entries, and ideas.