Isaac Asimov was a Russian-born, American author, a professor of biochemistry, and a highly successful writer, best known for his works of science fiction and for his popular science books. Professor Asimov is generally considered one of the most prolific writers of all time, having written or edited more than 500 books and an estimated 90,000 letters and postcards. He has works published in nine of the ten major categories of the Dewey Decimal System (lacking only an entry in the 100s category of Philosophy). Asimov is widely considered a master of the science-fiction genre and, along with Robert A. Heinlein and Arthur C. Clarke, was considered one of the "Big Three" science-fiction writers during his lifetime. Asimov's most famous work is the Foundation Series; his other major series are the Galactic Empire series and the Robot series, both of which he later tied into the same fictional universe as the Foundation Series to create a unified "future history" for his stories much like those pioneered by Robert A. Heinlein and previously produced by Cordwainer Smith and Poul Anderson. He penned numerous short stories, among them "Nightfall", which in 1964 was voted by the Science Fiction Writers of America the best short science fiction story of all time, a title many still honor. He also wrote mysteries and fantasy, as well as a great amount of nonfiction. Asimov wrote the Lucky Starr series of juvenile science-fiction novels using the pen name Paul French. Most of Asimov's popularized science books explain scientific concepts in a historical way, going as far back as possible to a time when the science in question was at its simplest stage. He often provides nationalities, birth dates, and death dates for the scientists he mentions, as well as etymologies and pronunciation guides for technical terms. Examples include his Guide to Science, the three volume set Understanding Physics, and Asimov's Chronology of Science and Discovery. Asimov was a long-time member and Vice President of Mensa International, albeit reluctantly; he described some members of that organization as "brain-proud and aggressive about their IQs" He took more joy in being president of the American Humanist Association. The asteroid 5020 Asimov, the magazine Asimov's Science Fiction, a Brooklyn, NY elementary school, and two different Isaac Asimov Awards are named in his honor.

Fritz Reuter Leiber Jr. was one of the more interesting of the young writers who came into HP Lovecraft's orbit, and some of his best early short fiction is horror rather than sf or fantasy. He found his mature voice early in the first of the sword-and-sorcery adventures featuring the large sensitive barbarian Fafhrd and the small street-smart-ish Gray Mouser; he returned to this series at various points in his career, using it sometimes for farce and sometimes for gloomy mood pieces—The Swords of Lankhmar is perhaps the best single volume of their adventures. Leiber's science fiction includes the planet-smashing The Wanderer in which a large cast mostly survive flood, fire, and the sexual attentions of feline aliens, and the satirical A Spectre is Haunting Texas in which a gangling, exo-skeleton-clad actor from the Moon leads a revolution and finds his true love. Leiber's late short fiction, and the fine horror novel Our Lady of Darkness, combine autobiographical issues like his struggle with depression and alcoholism with meditations on the emotional content of the fantastic genres. Leiber's capacity for endless self-reinvention and productive self-examination kept him, until his death, one of the most modern of his sf generation. Used These Alternate Names: Maurice Breçon, Fric Lajber, Fritz Leiber, Jr., Fritz R. Leiber, Fritz Leiber Jun., Фриц Лейбер, F. Lieber, フリッツ・ライバー

Works of American science-fiction writer Robert Anson Heinlein include Stranger in a Strange Land (1961) and The Moon Is a Harsh Mistress (1966). People often call this novelist "the dean of science fiction writers", one of the most popular, influential, and controversial authors of "hard science fiction." He set a high standard for science and engineering plausibility and helped to raise the standards of literary quality of the genre. He was the first science-fiction writer to break into mainstream, general magazines such as The Saturday Evening Post, in the late 1940s. He was also among the first authors of bestselling, novel-length science fiction in the modern, mass-market era. Also wrote under Pen names: Anson McDonald, Lyle Monroe, Caleb Saunders, John Riverside and Simon York.

Aka Owen Fox Jerome, Owen F. Jerome. Oscar Jerome Friend began his career primarily as a pulp fiction author in various genres including horror, Westerns, science fiction, and detective fiction. As a pulp writer he worked with Wonder Stories, Startling Stories, Strange Stories, Captain Future and Thrilling Wonder Stories. He was also co-editor for several anthologies.

Alfred Elton van Vogt was a Canadian-born science fiction author regarded by some as one of the most popular and complex science fiction writers of the mid-twentieth century—the "Golden Age" of the genre. van Vogt was born to Russian Mennonite family. Until he was four years old, van Vogt and his family spoke only a dialect of Low German in the home. He began his writing career with 'true story' romances, but then moved to writing science fiction, a field he identified with. His first story was Black Destroyer, that appeared as the front cover story for the July 1939 edtion of the popular "Astounding Science Fiction" magazine.

Theodore Sturgeon (1918–1985) is considered one of the godfathers of contemporary science fiction and dark fantasy. The author of numerous acclaimed short stories and novels, among them the classics More Than Human, Venus Plus X, and To Marry Medusa, Sturgeon also wrote for television and holds among his credits two episodes of the original 1960s Star Trek series, for which he created the Vulcan mating ritual and the expression “Live long and prosper.” He is also credited as the inspiration for Kurt Vonnegut’s recurring fictional character Kilgore Trout. Sturgeon is the recipient of the Hugo Award, the Nebula Award, and the International Fantasy Award. In 2000, he was posthumously honored with a World Fantasy Award for Life Achievement.

Lester del Rey was an American science fiction author and editor. Del Rey is especially famous for his juvenile novels such as those which are part of the Winston Science Fiction series, and for Del Rey Books, the fantasy and science fiction branch of Ballantine Books edited by Lester del Rey and his fourth wife Judy-Lynn del Rey. Also published as: Philip St. John Eric van Lihn Erik van Lhin Kenneth Wright Edson McCann (with Frederik Pohl)