Prentiss Riddle was born in 1959 and grew up in Fort Worth, Texas and Stillwater, Oklahoma. From a young age, he was an avid reader of science fiction.

Riddle entered the zine scene around 1971, at the age of 12 years. His older cousin Tommy Riddle invited him to join the APA Myriad. This marked the beginning of his interest in zines and self-publishing. Riddle was active in Myriad through his early teens, creating and editing apazines such as Pshaw!, P. Riddle Lumber Co., Mimeo, Ker-Plunk, and many others. He also contributes to other APAs such as Argos, with zines including Lazarus Long Lives! t-shirt, Hmmmmmmm, and Lonely are the Unshared Stars. He attended UT Austin from 1978-1984 and stayed on as an employee in the CS Department through 1986. Starting in 1983 or 1984, he became active in various campus political groups. Drawing on hid background in zines, I wrote and edited some of the newsletters and flyers in the University Peace and Justice Coalition materials.

Riddle currently resides in Portugal.