Roger is a historian, and strictly speaking an amateur one, but he does great work and gets things right. "White Ensign Flying" is a terrific read, telling the story of the men who served in HMCS Trentonian, the last corvette sunk in the Second World War.
Here is Roger with his two books; I'm looking forward to the next one. More of his work can be found at his website. He's currently working on a history of WW II shipbuilding in Trenton, Ontario. He says the town turned out 170 vessels of various sizes that saw service all over the Commonwealth, and some of them are still in service today.