Over the last 25 years of my career—from serving as a partner at the Boston Consulting Group (BCG), to my time at Delta Air Lines, to my current role as president and CEO of Red Hat—I've been exposed to my fair share of leaders. I've learned that leaders and leadership styles can vary greatly depending on the company culture, industry and size, but there's one commonality I've noticed among all of them: to be effective, leaders must be respected.