He also was the editor of The Visual Encyclopedia of Science Fiction (1977: UK, Pan Books; US, Harmony/Crown Books, ), which contained chapter introductions from science fiction authors as well as articles on the themes of science fiction written by himself and others. The latter title was, in 1978, listed as one of the ALA Best Books for Young Adults. He was married once, and had two children.
He edited "The Visual Encyclopedia of Science Fiction" (1977, UK Pan Books; US Harmony/Crown Books), which featured introductions by science fiction authors and articles on science fiction themes written by him and others. This book was recognized as an ALA Best Book for Young Adults in 1978. He was married once and had two children.