It's by Gordon Livingston. He's a psychiatrist and author. He graduated from West Point, served in Vietnam, and although I did not know it when I started reading the book, he lost an adult son to suicide and a child to leukemia in the same year.
It is about living a life with courage and what that means. I don't agree with everything he says, but I agree wholeheartedly with his main premise:
"The best psychological antidote turns out to be some combination of hope and courage. How these virtues are acquired, manifested, and taught are at the core of this book. It is not easy to live a courageous life, and no one is brave all the time or in every circumstance."