Explanation:

The Practice of Management is written by Peter F Drucker. Peter Drucker (1909-2005) was one of the most widely-known and influential thinkers on management, whose work continues to be used by managers worldwide. 
Peter Drucker (1909-2005) was one of the most widely-known and influential thinkers on management, whose work continues to be used by managers worldwide. He was a prolific author, and among the first (after Taylor and Fayol) to depict management as a distinct function and being a manager as a distinct responsibility. His writing showed real understanding of and sympathy for the difficulties and demands faced by managers.

Throughout his long career he has had interests as diverse as journalism, art appreciation, mountaineering, reading - drawing inspiration from the works of Jane Austen - and, of course, management teaching, writing and consultancy.