Miles John Breuer was an American physician and science fiction writer of Czech origin. Although he had published elsewhere since the early 20th century, he is considered the part of the first generation of writers to appear regularly in the pulp science fiction magazines, publishing his first story, "The Man with the Strange Head", in the January 1927 issue of Amazing Stories. His best known works are "The Gostak and the Doshes" (1930) and two stories written jointly with Jack Williamson, "The Girl from Mars" (1929) and The Birth of a New Republic (1931).

John Stewart Williamson, who wrote as Jack Williamson, was an American science fiction writer, one of several called the "Dean of Science Fiction". He is also credited with one of the first uses of the term genetic engineering. Early in his career he sometimes used the pseudonyms Will Stewart and Nils O. Sonderlund.