Founders are known to attract prospective employees by signaling their startup’s mission, culture, and potential. But do they also shape who stays? And if so, does the founder’s influence diminish as the startup matures? Using matched employer-employee data from the U.S. Census, we address these questions, especially focusing on cases of founder premature death to identify plausibly exogenous exits. We find that founder departures significantly increase employee turnover. These effects are stronger in older and larger startups. Further analyses show that the impact of founder departure is more salient among employees who had longer shared tenure or have the same sex as the founder. These patterns suggest that employees develop complementarities with founders over time—an alignment in skills, relationships, or culture—that reinforce founders’ influence as startups mature.