CHICAGO - Author Frederik Pohl, who over decades gained a reputation of being a sophisticated writer of science fiction, has died.

His wife, Elizabeth Hull, says Pohl died Monday at an Illinois hospital after experiencing respiratory problems at his home in the Chicago suburb of Palatine. He was 93.

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News of his death was first announced late Monday by his granddaughter, Emily Pohl-Weary, in a tweet.

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

A prolific writer, two of Pohl's better known works were "The Space Merchants," written in the early 1950s with Cyril M. Kornbluth, and 1978's "Gateway" a winner of the Hugo Award for science fiction writing.