Sean Ahrens is a recognized expert in workplace violence and security, frequently advising businesses on best practices to enhance safety. His expertise is particularly valuable in addressing the growing trend of thefts involving ATMs in Chicago. Ahrens recommends proactive measures such as removing cash from ATMs overnight, using thicker glass, and bolting down machines to prevent theft. His insights help businesses understand the importance of protecting high-value assets and implementing strategies to deter criminals effectively.