This paper investigates the impact of individual managers on corporate behavior and performance. The authors construct a manager-firm matched panel dataset to track top managers across different firms over time, finding that manager fixed effects significantly influence a wide range of corporate decisions. They identify specific patterns in managerial decision-making that reflect differences in "style" among managers. Managers with higher performance fixed effects receive higher compensation and are more likely to be found in better-governed firms. The study also examines observable managerial characteristics, such as birth cohort and MBA graduation, and finds that older CEOs tend to be more conservative, while MBA graduates tend to follow more aggressive strategies. The findings suggest that individual managers play a crucial role in shaping corporate practices and outcomes.This paper investigates the impact of individual managers on corporate behavior and performance. The authors construct a manager-firm matched panel dataset to track top managers across different firms over time, finding that manager fixed effects significantly influence a wide range of corporate decisions. They identify specific patterns in managerial decision-making that reflect differences in "style" among managers. Managers with higher performance fixed effects receive higher compensation and are more likely to be found in better-governed firms. The study also examines observable managerial characteristics, such as birth cohort and MBA graduation, and finds that older CEOs tend to be more conservative, while MBA graduates tend to follow more aggressive strategies. The findings suggest that individual managers play a crucial role in shaping corporate practices and outcomes.