Rick Kamal prefaced a list of cybersecurity tips with some advice from the annals of history. Ancient history. The CTO at Harvard Business School invoked Galen, the Greek physician of the second century. Galen served as the personal doctor to several Roman emperors, and his discoveries influenced medicine, physiology and anatomy for 1,500 years. His teaching about maintaining good health was simple: A little prevention goes a long way, Kamal explained to an audience of IT executives.