John G. Hemry (LCDR, USN ret.) is an American author of military science fiction novels. Drawing on his experience as a retired United States Navy officer, he has written the Stark's War and Paul Sinclair series. Under the name Jack Campbell, he has written six volumes of the Lost Fleet series. He has also written over a dozen short stories, many published in Analog magazine, and a number of non-fiction works.

Henry plans to continue the Lost Fleet series with two spin-offs: Beyond the Frontier, focusing on the main characters from the Lost Fleet, and Phoenix Rising, focusing on the collapse of the Syndicate Worlds.

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