John Hemry is an American writer of military SF, drawn on his experience as an United States naval officer. He wrote two series under his own name, the Stark's War and Paul Sinclair series. Poor sales had him resort to a pen name Jack Campbell for The Lost Fleet series; its success has lead to the reissue of his earlier work (with both bylines listed on the cover).The Other Wiki has more here.
Works by John Hemry that have their own pages
Tropes found in his work