Historian Geoffrey Perret has written fine biographies of Abraham Lincoln, Ulysses S. Grant, Douglas MacArthur and John F. Kennedy.
Perret’s theme: Motivating Men.
As Perret points out, these four leaders encompass almost every form of leadership. And each had been on campaign, leading troops. Each had a literary sensibility.
I recommend this hour-long speech most highly.
Geoffrey Perret Speech on Lincoln Leadership