## TL;DR
Leadership is not innate — it's a set of learnable behaviors. Modern leadership theory has shifted from trait-based models to behavioral, situational, and transformational approaches.

## Core Explanation
Leadership theory evolution: trait theories (1940s)→behavioral theories (1950s)→contingency theories (1960s-70s)→transformational leadership (1980s)→authentic/ethical/servant leadership (2000s).

## Detailed Analysis
Psychological safety was identified by Google's Project Aristotle as the #1 predictor of team performance. Intrinsic motivation (autonomy, mastery, purpose) outperforms extrinsic rewards for complex cognitive work.

## Further Reading
- Harvard Business Review: Leadership
- Center for Creative Leadership
- Academy of Management Journal