Julian Barnes in The Guardian:
…Stoner was published in 1965, and – as is usually the case – it steered a mid‑course between the novelist's fears and his hopes. It was respectably reviewed; it had a reasonable sale; it did not become a bestseller; it went out of print. In 1972, Augustus, Williams's “Roman” novel, won half the National Book Award for fiction (the other half going to John Barth's Chimera). It was his largest moment of public success, yet he did not even attend the ceremony; perhaps he was rightly suspicious, as the laudatum pronounced in his absence was strangely disparaging. When he died, two decades later, without publishing any more fiction, the New York Times obituarist treated him as much as a poet and “educator” as a novelist. But still to come was that factor – identified by Williams in his letter – that novelists often write about, that they fear, but also place their trust in: time. And time has vindicated him way beyond his own modest hope. Fifty years after Williams wrote to his agent, Stoner became a bestseller. A quite unexpected bestseller. A bestseller across Europe. A bestseller publishers themselves could not quite understand. A bestseller of the purest kind – one caused almost entirely by word-of-mouth among readers.
More here. (Note: Read it, loved it, gave it to many friends who loved it. It is the male version of Madame Bovary. Do read it.)