Robert Silverberg ("Silverbob" to his friends[[note]]often spelled "[=AgBob=]"--"Ag" is the chemical symbol for silver[[/note]]) is an enormously prolific science fiction and fantasy writer, and winner of multiple UsefulNotes/{{Hugo|Award}} and UsefulNotes/{{Nebula Award}}s.

Starting his career in the 1950s, Silverberg was an instant hit, earning a special Hugo for Best New Writer. During this period, he was tremendously prolific, using several pen-names, including David Osborne and Calvin M. Knox, as well as his own name. He also regularly collaborated with Creator/RandallGarrett; the two usually published as "Robert Randall".

It was in the sixties, though, that Silverberg really found his voice. The "{{New Wave|ScienceFiction}}" movement was pushing science fiction toward more literary experimentation, and Silverberg, though never actually a part of that movement, was inspired to write more complex and mature works that opened up new audiences for him. Some of his works from this period, including the novels ''To Live Again'', ''The World Inside'', and ''Dying Inside'', as well as the award-winning novella "Nightwings", are still considered among his best.

After briefly retiring in the mid-seventies for health and personal reasons, Silverberg returned in 1980 with his smash hit, ''Lord Valentine's Castle'', the first book of the ''Literature/MajipoorSeries'', which now has over half a dozen novels and many short stories. He continues to write a wide variety of SF. In 2004, he was named a [[UsefulNotes/DamonKnightMemorialGrandMasterAward SFWA Grand Master]].

His short story "To See The Invisible Man" was adapted for ''Series/TheTwilightZone1985''.

!! Works with a page on this Wiki:
* ''[[Literature/DangerousVisions Flies]]''
* ''Literature/MajipoorSeries''
* ''Literature/{{Nightfall}}'', co-writer of the novel (with Creator/IsaacAsimov)
* ''Literature/RomaEterna''
* ''Literature/TheWorldInside''
!!His works provide examples of:
* AdaptationExpansion: In the early 1990s, for no readily apparent reason, he wrote novel-length expansions of three of Creator/IsaacAsimov's most famous short stories.
* AfterTheEnd: In ''At Winter's End'' and ''The New Springtime''. [[spoiler:[[HumansThroughAlienEyes Humans as we know them are extinct]], and the viewpoint characters are [[{{Xenofiction}} mutant baboons]].]]
* AllohistoricalAllusion: "A Hero of the Empire" has the Roman main character speculating what the world would be like if he doesn't [[spoiler:assassinate Mohammed before Islam takes off.]] He does.
* ArtificialHuman: The misnamed "androids" of ''Tower of Glass''. They're visually distinguished from "normal humans" (whom they call "womb-born", and themselves "vat-born") by red skin and lack of body hair.
* BioAugmentation: In the story "At the Conglomeroid Cocktail Party", genetic engineering is such a common and casually-regarded thing in the far future that people actually hold "fetus parties" where they invite the guests to come up with the best design for the hosts' future offspring.
* BirthDeathJuxtaposition: Enforced out of necessity, due to limited resources, at the beginning of ''At Winter's End''. Almost no one's allowed to conceive a child to begin with; the few who ''are'' allowed to procreate are required to wait until someone's committed ritual suicide at the allotted age.
* TheBlackDeath: In ''Up the Line'', there is a popular series of time tours tracing the 14th century Black Death epidemic. Protagonist Jud, while a bit depressed, takes one tour in the series of four (it was the one he could get a spot in on short notice).
* BlindAndTheBeast: In "To See the Invisible Man", a man sentenced to a year of "societal" invisibility manages a brief conversation with a blind man, who ends up rejecting him just like everybody else.
* BrainInAJar: in "Nightwings", brain jars effectively serve as information storage systems.
* BrainUploading: In ''To Live Again'', the rich commonly back up their minds using Brain Uploading. No artificial hardware can run a recorded mind, though, so their hope of immortality is to be chosen to be downloaded into a living person's head to act as a kind of technological SpiritAdvisor. (A person may be chosen for their intelligence, creativity, or just because they've lived a very different life and can offer a fresh perspective.)
* CameBackWrong: in ''Recalled to Life''
* CasualTimeTravel: Deconstructed in "Needle in a Timestack"--with no system of TimePolice, one narcissist with relationship issues manages to ruin a ''lot'' of lives.
* LesCollaborateurs: In ''Literature/TheAlienYears'', a computer geek works for invading aliens because it gets him laid.
* DeathWorld:
** ''Face of the Waters'' takes place on an aquatic example. The entire planet is water and a few floating "islands" of coral, inhabited by invincible rammerfish, mouths that can swallow islands whole, orifice-invading eels, and worse. The only actual land is the Face of the Waters, a hunk of bare psychic-radioactive rock that possesses whoever comes near it. The humans face all this with Bronze Age level technology, since there's no metal or trade on the planet.
** This trope could have been ''very easily'' instead named ''Planet Of Death'', after his 1960 novel. With such wonderful things upon the 'Let me eat you first' carnivorous flora-covered landscape like quicksand-like pits that are actually incredibly intense forms of acid and razor-toothed, flesh-eating birds, this is a place where ''literally everything that you see'' has one thought on its mind: ''it wants to eat you.''. [[MoreDakka After the heavily-armed explorers]] are wiped out to all but the last two men, they have the following conversation before they get the hell outta there:
--> '''Man #1:''' There's just one more thing. The rules say that we have to give the planet a name before we leave. We haven't done that yet.
--> '''Man #2:''' [[ExactlyWhatItSaysOnTheTin That's easy. We just call it the 'Planet Of Death'.]]
* {{Demythtification}}: ''Gilgamesh the King'' is a retelling of Literature/TheEpicOfGilgamesh, sans supernatural elements; the "scorpion people", for instance, are just a family with a skin condition.
* DividedStatesOfAmerica: The short story "The Palace at Midnight" is set in The Empire of San Francisco, in a ''really'' balkanised USA. One of the characters is the ambassador from the Republic of Monterey; also mentioned are the Holy Carolina Confederation, the Three Kingdoms of New York, the Realm of Wicca in Oregon, and The Grand Duchy of Chicago.
* DystopianEdict: In "To See The Invisible Man", society requires everyone to be friendly and warm to each other at all times. Anyone convicted of being "cold" must spend an entire year with a mark on their forehead that warns everyone else not to acknowledge their existence in any way.
* EasyAmnesia: ''How It Was When The Past Went Away'' has three drugs that do this, varying in what part of the brain they wipe. A paranoiac dumps all three of them in the water supply of a major city as a way of taking revenge on the world around him, and winds up creating a blissful cult of people who drink to forget all their mistakes and frailties. (This is apparently supposed to be a good thing.)
* TheEmpath: Interesting version in ''The Man in the Maze''. The titular man gains, as a result of a contact with alien race, an inverted version of empathy -- he doesn't receive emotions, he constantly projects his own. All of them, down to and including subconscious ones. As it turns out, these deep human emotions are mostly quite unpleasant... As a result, nobody can stay close to him for any length of time (the strength of the psychic barrage is decreasing with distance), and he has to hide in the nigh-inaccessible maze.
* EmptyShell: In ''Recalled to Life'', a process is invented that can restore recently dead (i.e. within a day or so) people to life. (It doesn't actually heal whatever killed them, so it's mostly useful for drownings and the like.) One catch: there's about a one-in-six chance of restoring a mindless shell.
* EquivalentExchange: in ''The Time Hoppers'', material objects can only travel to another time by swapping places with an equivalent mass.
* ExpendableClone: A KillAndReplace inversion is "The Far Side of the Bell-Shaped Curve". Let's just say the title doesn't indicate [[TooDumbToLive which far side of the curve]] the main character's on.
* ExtraDigits: In ''Across A Billion Years'', the protagonist's LoveInterest Jan Mortenson has six toes on both feet, 40 teeth, and some other minor differences from humans due to being a half-blood (three-quarters human and one quarter alien). The protagonist sees this as a CharmPoint.
* EyelessFace: Victor Farkas in ''Hot Sky at Midnight''
* TheGreatestHistoryNeverTold: ''Gilgamesh the King'' is a {{Demythtification}} of ''Literature/TheEpicOfGilgamesh'', set in Mesopotamia around 2500 BCE.
* HollowWorld: ''Across A Billion Years''
* HumansAreUgly: According to the dolphin narrator of "Ishmael in Love", anyway. [[spoiler:And [[HumansThroughAlienEyes to the empathic super-baboons]] in ''At Winter's End'' and ''The New Springtime'', we [[AfterTheEnd looked]] kind of like TheGreys.]]
* HumansThroughAlienEyes: Or sometimes, through the eyes of dolphins [[spoiler:or empathic super-baboons]].
* ImmortalitySeeker: In ''The Book of Skulls'', all four of the protagonists are looking for eternal life. Which ones are the villains and which the heroes for doing so becomes increasingly less clear-cut as the novel progresses.
* ImpossibleTask: In the story "Double Dare", a team of Earth engineers and a team of alien engineers are engaged in a challenge where each is to duplicate some feat of the other's technology. Both sides cheat by presenting a rigged demo of a device they can't actually build. Both teams, [[AchievementsInIgnorance not knowing that what they're trying to do is supposed to be impossible, succeed.]]
* IntelligentGerbil: The Nildoror in ''Downward to the Earth'' are basically sentient elephants [[spoiler:who, for spiritual reasons, become sentient bear/tapir creatures every few years]].
* IWantMyJetpack: The 1960 book ''Lost Race of Mars'' told the story of two preteen siblings whose parents were taking them to Mars to spend an Earth year, starting in the middle of 2017. This story predicted a city, their host city, having been founded in 1991, and a manned spaceship reaching Mars in 1970. Well...
* JapanTakesOverTheWorld: ''Hot Sky At Midnight'' has a dystopian future where the Earth's climate has been damaged beyond all repair, two Japanese mega-corps have taken over the world economy and are battling for supremacy: Samurai Industries, based out of Tokyo, and Kyocera-Merck, based out of Kyoto. Most workers are stuck in their company, hoping for a job that has "slope" to a better grade (as in, pay grade). Positions within the company hierarchy are highly stratified, with one's level of clearance determined by position; asking questions beyond your grade is bad for your career health. These positions are known as "Salaryman X", with X being a number (a lower number means a higher rank). Interestingly, just having a "Japanese" name, or being part Japanese, does not guarantee any favourable position; only the "purest" and most dedicated are worthy to ascend the ranks.
* MarkOfShame: In the short story "To See The Invisible Man", a man is punished for "coldness" by having a mark affixed to his forehead so everyone else will know to shun him.
* MyOwnGrampa: ''Up the Line'' has a character who is trying to sleep with all his female ancestors, except his mother (as he puts it, "I draw the line at abominations"). He's careful not to father any children, he is just seeking to cuckold all of his male ancestors (except his father because sleeping with his own mom would be sick).
* NakedOnArrival: ''The Masks of Time'' begins with a time traveller from a millennium in the future arriving on the Spanish Steps in Rome, stark naked. Played with -- the point-of-view character isn't present for the arrival itself and only knows about it through the TV news reports, which include witnesses arguing about exactly how naked he was.
* NoEnding: ''Up the Line'' ends with the hero [[spoiler:hiding from the Time Service in an obscure era where with any luck they'll never find him. He knows however that his respite is only temporary, since instead of killing him directly they can ''cause him to never have existed in the first place'', and even as he speculates this, his narration just as he predicted is cut off short in mid-sentence]].
* NonSequiturCausality: In the short story "Needle In A Timestack", time travel is common for holidays, so minor changes (your car was a grey Toyota, now it's a silver BMW) are just "the little annoyances of modern life". Unless your wife's first husband is trying to undo his divorce.
* NoTranshumanismAllowed: Played in a minor note in ''The Great Conglomeroid Cocktail Party''. Transhumanism itself isn't necessarily bad--what's bad is when those who have modified themselves start to [[PunyHumans look down on]] ([[FantasticRacism and exploit]]) everyone else.
* OneSteveLimit: In ''The Alien Years,'' a rugged retired colonel named Anson founds a self-sustaining community of rugged survivors on his ranch near LA. Many of his descendants are named Anson, making it hard to tell them apart. (It doesn't help that they all have the same role in their community, and all act the same.)
* ParentalIncest: In ''Up the Line'', one of the Couriers, who has some ''major'' father issues, has a goal to sleep with every female ancestor he has, as a gesture of contempt toward their mates. (Although he does skip his actual mother: "I draw the line at abominations".)
* PlagiarismInFiction: The protagonist of ''Dying Inside'' makes his (not very good) living by selling plagiarized papers to college students.
* PosthumousNarration: In ''The Book of Skulls'', two of the four narrators are dead by the end of the story, yet they still narrate the events leading up to their death, leaving the reader wondering who it is to whom they were actually talking.
* PoweredByAForsakenChild: In''The Book Of Skulls'', four friends somehow hear about a cult that offers immortality: applicants must be in groups of four, one of whom must commit suicide, and one of whom must be murdered by the others. The survivors get to live forever. Or so they've heard.
* TheQuisling: In ''The Alien Years'', a nerdy hacker breaks into the conquering aliens' computer system, but instead of trying to use it against them, he offers them his help in return for power and a harem.
* RagnarokProofing: In ''Across A Billion Years'', the protagonist (who is a junior member of a mixed alien archaeological expedition) is off to a dig site containing artifacts of the High Ones, a race that existed over a BILLION years ago, give or take a hundred million years. All the technology found is in perfect working order including a large sphere that proves to be a holographic projector that sends them questing after the lost secrets of these ancient precurser beings. Think about that, the percentile error alone covers a span of geological time greater than the death of the dinosaurs all the way to now and the stuff works perfectly even advanced robots stored on asteroids in the depths of space. Even if something is 100.00 percent proof against rust, corrosion by oxygen, UV radiation, deterioration caused by plants taking root, and [[ArsonMurderAndJaywalking inedible]], over that time scale you'd expect it to be engulfed in lava or hit by an asteroid.
* RealityShow: Foretold in ''The Pain Peddlers'', with a horrid TV show that gives new meaning to the phrase "Operating theater".
* ReligiousRobot: "Good News from the Vatican" is a satirical look at the election of the first robot Pope. Obviously to become Pope he'd have needed to spend years working his way up to cardinal.
* RingWorldPlanet: a concave world, in ''Across a Billion Years''
* RippleEffectProofMemory: ''Up the Line'' discussed this and other temporal oddities fairly well.
* RobotMaid: "[[MeaningfulName Bismarck]]," in the short story "The Iron Chancellor," is a RobotMaid [[spoiler:with a nasty twist]].
* SwitchingPOV: ''The Book of Skulls'' has 4 [=PoVs=], all first person. He's said that he found getting the voices right and distinct quite difficult. And it wasn't like he was new in the field at the time!
* ThankTheMaker: In ''Tower of Glass'', the "androids"[[note]]misnamed -- they're artificially created biological beings, who tend to refer to themselves as "vat-born", with humans being "womb-born"[[/note]] worship the man who created the process by which they're made. This leads to an all-out rebellion when said creator shatters their faith by fervently denouncing their personhood.
* TimePolice: The Time Patrol in ''Up the Line''.
* TimeTravelForFunAndProfit: In ''Up the Line'', most of the major characters work for the Time Service. The protagonist and several other characters are Couriers, who take parties of tourists to sightsee historical events. One use for the hefty fees charged to the tourists is financing scholarly research via time travel.
* TooDumbToLive: ''The Far Side of the Bell-Shaped Curve''. The main character's right about being [[TitleDrop on the far side of that bell-shaped curve of intelligence]], but not necessarily right about what side.
* TranslationConvention: Explicitly pointed out in the foreword to ''Nightfall''
* VichyEarth: ''The Alien Years'' is a novel based on this concept- the "Entities" move in and take over, complete with [[Film/TheDayTheEarthStoodStill1951 shutting off the electricity]].
* TheWarOfEarthlyAggression: in ''Revolt on Alpha C''
* WaterSourceTampering: In "When the Past Went Away", amnesia-inducing drugs are dumped in a city's water supply, leaving everybody in the city with no memory of who they are.
* WhodunnitToMe: In ''To Live Again'', which features a form of BrainUploading, one of the subplots involves an uploaded mind investigating her own murder.
* {{Xenofiction}}: Played with a lot.