Peter Drucker Quotes
If analysis shows that someone's brilliant work fails again and again as soon as cooperation from others is required, it probably indicates a lack of courtesy - that is, a lack of manners.
Drucker, Peter F. "Managing Oneself." Harvard Business Review, vol. 77, no. 2, Mar.-Apr. 1999, p. 70.
His interviewer had asked him what he, as a cultural critic and a political essayist, thought of Donald Trump’s campaigning style.
Peter Ferdinand Drucker was an Austrian management consultant, educator, and author, whose writings contributed to the philosophical and practical foundations of the modern business corporation. He was also a leader in the development of management education, he invented the concept known as management by objectives and self-control, and he has been described as "the founder of modern management".