This document summarizes chapters 1-6 of a leadership and change management textbook. Chapter 1 defines leadership as a dynamic relationship based on mutual influence between leaders and collaborators to achieve common goals and drive change. It discusses different leadership theories including trait, behavioral, contingency, and transformational. Chapter 2 discusses leadership styles and theories including trait theory which focuses on identifying personal characteristics of effective leaders. It also discusses behavioral theories and contingency theories. Chapter 3 discusses situational leadership theory which states there is no single best leadership style and the most effective style depends on the situation.