Barnaby Jack became famous for exposing vulnerabilities in medical devices.

In 2010, he hacked an ATM to make it dispense cash, a technique he called "Jackpotting." In 2012, he demonstrated how he could wirelessly hack insulin pumps and pacemakers, potentially delivering fatal doses or shutting down the devices. His work prompted manufacturers to improve security of medical devices, highlighting importance of cybersecurity in healthcare. Jack's ethical hacking helped improve technology and save lives.