The following list is my opinion on the top ten authors of science fiction of all time.  The list is in no particular order so number one doesn’t mean the greatest.  Be sure to check out my Top 10 Science Fiction Books/Novels of all time also published here on Triond.  Thanks.

1. Jules Verne — Around the Moon, From Earth to the Moon, 20,000 Leagues Under the Sea, Around the World in 80 days.  Need I say more.  Incredible author, one of the pioneers of science fiction novels.
2. H.G. Wells– The Time Machine, War of the Worlds, The Invisible Man, Island of Dr. Moreau.  Another pioneer of science fiction.  War of the Worlds is considered to be one of the best science fiction novels of all time. 
3. Ray Bradbury– The Martian Chronicles, Fahrenheit 451, Bradbury’s Short Stories, Dandelion Wine.  Still writing today and has not lost a bit of his talent.  Fahrenheit 451 is considered one of the best works of all time in science fiction.
4. Robert Heinlein– Stranger in a Strange Land, Starship Troopers, The Moon is a Harsh Mistress.   The Stranger in a Strange Land novel has been mentioned as possibly the most important science fiction book ever written. 
5.  Isaac Asimov — The Gods Themselves, Foundation Trilogy, I-Robot, Prelude to Foundation.  Foundation Trilogy has been mentioned by numerous authors in the science fiction field as the best novel ever written. 
6. Arthur Clarke– 2001: A Space Odyssey, Childhood’s End, Rendezvous with Rama, The Fountains of Paradise.  Incredible author who won numerous Hugos and Nebulas for his novels.  2001: A Space Odyssey was a huge success both as a book and as a movie.
7. Frank Herbert — Dune, Sands of Dune, The Jesus Incident.  Dune is considered one of the best novels of all time.  This novel was also a huge success as a motion picture. 
8. Frederick Pohl– Considered to be the last living legend of the golden age of science fiction.  Gateway, Man Plus, Homegoing, The Last Theorem.  Both Gateway and Man Plus are considered masterpieces of science fiction.
9. Ursula Le Guin– The only female author to make the top 10 list.  Entire Earthsea Series, The Left Hand of Darkness, The Dispossessed .   She has won more Locus awards for her novels than any other writer in science fiction
10. Robert Silverberg– A Time of Changes, Dying Inside, Majipoor Series, Kingdoms of the Wall.  Considered to be one of the best authors of the 20Th century.  Won numerous awards for his novels.

Honorable Mention

Greg Bear — Numerous awards for his novels.  Anvil of Stars, Blood Music, Darwin’s Radio.

Kim Robinson – Entire Mars series is a classic. Incredible series.  Red Mars, Green Bars, Blue Mars, The Martians.

Harlan Ellison – He is second in number of awards (behind Le Guin) for all of his novels.  Angry Candy, Deathbird Stories, A Boy and His Dog.

Philip K. Dick, Jack Williamson, Philip Jose Farmer, E.E. Doc Smith, Douglas Adams, Ben Bova, Orson Scott Card are all other great authors in the field.

So there you have my list of the top ten authors in science fiction of all time.  Please feel free to comment about agreements and disagreements with this list.