Theodore Roosevelt regarded leadership as his one gift, the area in which he might be considered to possess genius. He presented his views on leadership throughout his voluminous writings. He intended for future writers to study them with an eye toward action, as he himself had done of historic figures.

My books arose from my own experience, when I sought guidance in practical leadership in my career. In sum, I strive to write the kind of book that I would find valuable in my own life.

Some critics have suggested that Ronald Reagan succeeded in a series of careers, ultimately as a two-term president of the United States, by a series of fortunate accidents. Such a criticism is not backed by the evidence. It is true, though, that Reagan's approach to work and life was not conventional.

I would suggest two approaches to begin the leadership journey in earnest. First would be to ask oneself, in every interaction with others over the course of a single day: How can you best serve this person? Another approach would be to attempt, over the course of a single day, to reframe your declarative statements into questions. The thoughtful use of questions can be transformational. In my experience, most people find these exercises more challenging - and more rewarding - than they would have imagined.

My Army reserve service was in the 1990s. It was, more than anything else, an opportunity for me to express gratitude. My understanding of and admiration for the American armed forces is deeper, better informed as a result. I'm among those who believe that military or other citizen service should be an expected part of every American's life.

Ronald Reagan memorably combined intimacy with distance.

One wonders if Lyndon Johnson and Richard Nixon's administrations may come to be viewed, in the future, as having been underestimated in some respects. To be sure, each ended in failure. Nonetheless, Johnson's accomplishments in civil rights and immigration legislation, and Nixon's in respect to relations with China, may loom larger with the passage of time.