What is a practical and useful definition of leadership? Textbooks with over 500 pages have been written about leadership and are so complex and deep that leaders can rarely work with the information to improve performance. A simple definition of leadership from Dr. Roger Levin is that leaders make other people successful. If you can find a way to work each day as a leader to help other people be successful in their work, then by definition you are an excellent leader, have advanced the practice, and improved everyone around you. What can you do today to help at least one other person be more successful in their job?