As executor of the estate of his father
Michael Shaara, he sold the film rights to The Killer Angels to filmmaker
Ron Maxwell, who filmed it as
Gettysburg: la dernière bataille (1993). Maxwell also encouraged him to continue his father's work to write about the rest of the Civil War. Jeff did so with a prequel, Gods and Generals, and a sequel, The Last Full Measure. He has also used his father's historical fiction approach to write about the American Revolution, Mexican-American War ,World War I and World War II and the Korean War.
