Paul Hersey was an American author and management expert, best known for developing the Situational Leadership Theory. Born in 1923, he focused on how leaders can adapt their style based on the needs of their team members and the specific situation at hand. His work emphasized the importance of flexibility in leadership. Hersey co-authored the book Management of Organizational Behavior with Ken Blanchard, which became a foundational text in the field of management. His theories have influenced various industries and continue to be taught in business schools around the world, highlighting the dynamic nature of effective leadership.