I invite you all to discover Peter F. Drucker, the man who is often considered as the pope of modern management. Let's think about this one :
"Management is doing things right, leadership is doing the right things".
Some links to discover the work of Peter Drucker :
We have certainly a lot to learn from Drucker. He wrote many books, wrote a lot of key papers and did set up conceptual theories that are still in use today. He was one of the strategist able to articulate ideas based on facts and a clear vision on the future.