CHICAGO (AP) — Author Frederik Pohl, who gained a reputation of being a sophisticated writer of science fiction, has died.

His wife, Elizabeth Hull, said Pohl died on Monday at an Illinois hospital after experiencing respiratory problems at his home. He was 93.

Born in New York City in 1919, Pohl became a literary agent and an editor before getting his own work published in magazines of the 1930s.

Two of Pohl’s better known works were “The Space Merchants,” and “Gateway” a winner of the Hugo Award.

Writer Frederik Pohl dead at 93