Knowledge has to be improved, challenged, and increased constantly, or it vanishes.
~Peter F. Drucker
Peter F. Drucker (born November 19, 1909) was a management consultant, educator, and author, whose prolific outpouring of books for more than half a century served as guideposts for the business world. His best-known works include The Effective Executive, Innovation and Entrepreneurship, The Practice of Management, and Concept of the Corporation. He was awarded the Presidential Medal of Freedom in 2002.