Today, if the CEO thinks it's a good idea, it's done everywhere; if the CEO thinks it's a bad idea, it's done nowhere. We ought to be more agnostic and open to learning things that we didn't expect - and the only way to do that is to try things and be open-minded about how well they are working. And third, evidence-based management involves reading and learning - just like doctors do - and to do so not just in school but afterward, as well.

You are more likely to acquire power by narrowing your focus and applying your energies, like the sun's rays, to a limited range of activities in a small number of domains.

I do not think anyone who ever saw Lyndon Johnson give a speech would call him charismatic, even though he was one of the most effective presidents in U.S. history. Same with Lincoln. Charisma is only one source of power, and probably not a very important one, at that.

Witness Donald Trump's current presidential campaign. So first people need to find the white spaces, the unexploited or underexploited niches where there is less competition and more opportunity.

I would give Obama a "C." He gets an "A" for understanding this country's profound problems in education, health care, infrastructure, and economic competitiveness, and for surrounding himself with extremely skilled and knowledgeable people who know what to do. He probably gets an "F," ironically, in his ability to sell these ideas to the American public and to be angry enough, conniving enough, and frankly mean enough to get them implemented and understood.

Your most important task as a leader is to teach people how to think and ask the right questions so that the world doesn't go to hell if you take a day off.

Everyone faces defeats, setbacks, reversals of fortune. But just like water wearing away rock, persistence triumphs. Resilience is one of the most important qualities I would look at in trying to predict who is going to be ultimately successful.