Charles Platt retreated from New York City to Northern Arizona in the 1990s, at which time he pretty much ceased writing science fiction, although he employed a science-fictional sensibility in his prolific work for several years as a senior writer for Wired magazine. This work was not much different from the speculative nonfiction which Platt used to write for Science Fiction Eye (back in the day), the primary distinctions being that Wired paid him well and put his text in front of a lot of people, although few ever remembered reading it. Such is the world of nonfiction magazines. In his previous career Platt wrote 41 books, including science fiction such as The Silicon Man, Protektor, Less than Human (under the name Robert Clarke), and Free Zone. He designed and eventually edited New Worlds magazine, and was science-fiction editor at Avon Books, for those with very long memories. Platt's most recent book is Make: Electronics (2009), an introductory nonfiction guide which he wrote and illustrated. He is a contributing editor to Make Magazine. This year he completed a new novel about a teenage female serial killer who runs amok in New Jersey. It is currently in the hands of his literary agent.

Platt has also been actively involved in cryonics, having participated in 21 cases since the early 1990s. He was variously chief operating officer of Alcor Foundation, cofounder and eventually president of CryoCare Foundation, and general manager of Suspended Animation Inc. Whether this is as embarrassing as, for example, Van Vogt's flirtation with Dianetics is debatable. Platt has said that he got involved in cryonics because it was the closest he could get to any of the science-fiction scenarios from his childhood.

In his wilderness location, he is designing and building prototypes of quasi-medical equipment to cool the human body.