Index P.259-265 ; Drucker on Marketing reflects Bill Cohen's unique ability to understand and communicate Peter Drucker's thoughts and ideas about [marketing] with the added touch of how to implement them in a dynamic and changing world. The whole story is that marketing must be viewed holistically. That's how successful companies see marketing. marketing is the driving force in these companies. Acquiring, keeping, and growing customers through ceating, communicating, and delivering value is the defining mission.