John G. Hemry

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.

Hemry has continued the Lost Fleet series with a spin-off: Beyond the Frontier, focusing on the main characters from the Lost Fleet. He has plans to begin a second called The Lost Stars, focusing on the collapse of the Syndicate Worlds.