American novelist and crime thriller paperback genre and short story writer. Colby wrote novels for a number of the paperback houses including Gold Medal, which published his most praised novel, The Captain Must Die. He was also a prolific contributor of short stories to Alfred Hitchcock and Mike Shayne's mystery magazines. Many of these have gathered into two published collections of his stories. Colby also wrote a non-fiction true crime book, The California Crime Book, and co-authored a 'Nick Carter' book, The Death's Head Conspiracy, with Gary Brandner. Author Ed Gorman believed "Robert Colby was one of the best of the paperback original writers".