Warren Bennis, author of Learning to Lead: A Workbook on Becoming a Leader, wrote "there is a profound difference between management and leadership, and both are important. To manage means to bring about, to accomplish, to have charge of or responsibility for, to conduct. Leading is influencing, guiding in a direction, course, action, opinion. The distinction is crucial. Managers are people who do things right and leaders are people who do the right thing."
Robert Sutton, "harking back to the Bennis theorem... proposes a corollary: To do the right thing, a leader needs to understand what it takes to do things right, and to make sure they actually get done."
