Because the best person to be the teams coach is the teams manager. Being a good coach is essential to being a good manager and leader. Coaching is no longer a specialty; you cannot be a good manager without being a good coach. The path to success in a fast-moving, highly competitive, technology-driven business world is to form high-performing teams and give them the resources and freedom to do great things. And an essential component of high-performing teams is a leader who is both a savvy manager and a caring coach.

Trillion Dollar Coach by Eric Schmidt