This document summarizes several theories of leadership. It discusses trait theory, which focuses on innate qualities, and behavioral theory, which examines how behaviors differentiate leaders. It also outlines models from the University of Iowa, Ohio State University, University of Michigan, and the managerial grid. Additionally, it covers situational contingency theory, including Fiedler's contingency theory and Hersey and Blanchard's contingency model. The Hersey-Blanchard model proposes that leadership style should depend on followers' maturity levels, matching styles like telling, selling, participating and delegating to low, medium and high maturity.