This document provides an overview of the evolution of leadership theories from the early 20th century to present day. It discusses early theories that viewed leadership through traits or as a mechanistic process. Later, researchers incorporated understanding of human motivation and relationships. Specifically, it outlines Hawthorne studies, Maslow's hierarchy of needs, Herzberg's two-factor theory, McGregor's Theory X and Y, and situational/contingency theories. The focus has shifted from leaders to the relationship between leaders and followers and understanding what drives worker satisfaction and productivity.