When our society talks about leaders, we focus on formal roles, such as the CEO. This view undervalues the role of informal leaders -- team members who influence outcomes by the tone they set, how they conduct themselves, and how they interact with their peers. Their job title doesn't include the word "manager," but they play an outsize role in how teams perform.
In this article, NFL great Tom Brady and Nitin Nohria, of Harvard Business School, present a set of principles that people in any realm can apply to help teams successfully work together toward common goals.