Boston Red Sox manager Alex Cora: skipper, strategist, cheerleader, motivator, friend, enemy (depending on the day), psychologist, risk taker. As a manager or a coach, you wear many many different hats. He is responsible for setting standards, giving the space for leaders to emerge, providing motivational speeches, and examining/observing his players and other teams. The unity of a team depends on how well (or in some cases how poorly) a manager can handle the mix of game strategy and people management.
One of my favorite coaches and the one with whom I think I’ve learned the most from was Vince Lombardi.