Martin Hetzer is a Salk’s vice president, chief science officer, and a professor. He uses a variety of techniques to pose questions about how adult tissues are maintained and repaired and why long-lived cells fail to work properly as a cell ages. On this episode of Where Cures Begin, Hetzer talks about why chronological age is different than biological age; what it means to be Salk’s Chief Science Officer; and what he learned from his grandfather the veterinarian.