Police chief (retd.) ​Kristen Ziman joined policing as a 17-year old cadet. She spent her 30-year career with the Aurora Illinois police department during which time she was the first woman lieutenant, first woman commander, and eventually the first woman chief. During her tenure as chief, a former employee walked into one of the city’s manufacturing companies, murdered five people and subsequently injured five police officers. We talk about that event, and the lessons she learned.