Very little is known about American Civil War photographer Timothy O’Sullivan — the man who took the haunting A Harvest of Death photograph in the aftermath of the Battle of Gettysburg — but a new book attempts to shine a light on him.

Very little is known about American Civil War photographer Timothy O’Sullivan — the man who took the haunting A Harvest of Death photograph in the aftermath of the Battle of Gettysburg — but a new book attempts to shine a light on him.