Running a team is hard because it ultimately boils down to people, and all of us are multifaceted and complex beings. Just like how there is no one way to go about being a person, there is no one way to go about managing a group of people.

And yet, working together in teams is how the world moves forward. We can create things far grander and more ambitious than anything we could have done alone. This is how battles are won, how innovation moves forward, how organizations succeed. This is how any remarkable achievement happens.

I believe this as deeply as I believe anything: Great managers are made, not born. It doesn’t matter who you are. If you care enough to be reading this, then you care enough to be a great manager.

Leadership is a quality rather than a job. We are all leaders and followers at different points in our lives. Many aspects of this book should be useful to those looking to grow as leaders as well as managers, and great managers should cultivate leadership not just in themselves but also within their teams.

This is an important distinction because while the role of a manager can be given to someone (or taken away), leadership is not something that can be bestowed. It must be earned. People must want to follow you.

I came to see, in my time at IBM, that culture isn’t just one aspect of the game—it is the game. In the end, an organization is nothing more than the collective capacity of its people to create value. Vision, strategy, marketing, financial management—any management system, in fact—can set you on the right path and can carry you for a while. But no enterprise—whether in business, government, education, health care, or any area of human endeavor—will succeed over the long haul if those elements aren’t part of its DNA.

But through that coaching he also showed them how to coach their people and teams, which made them much more effective managers and leaders. Time and time again, they note that whenever they face an interesting situation, they ask themselves, what would Bill do? And we realized, we do it, too. What would Bill do? How would the coach handle this situation?

I might leave the last word to Steve Jobs: ‘The only way to be truly satisfied is to do what you believe is great work. And the only way to do great work is to love what you do.’ As with Guinness, Messi and Messner, Jobs’s career illustrates that high professional skill is often associated with extreme self-absorption. Claudio Abbado, who seems to have been distinguished from most conductors by a degree of personal modesty, explained why he had chosen not to conduct American orchestras: ‘they finish the rehearsal not because the music is finished, but because the time is finished.