In the U.S., critical infrastructure consists of sixteen essential sectors that make daily life possible. National critical functions are the functions of government and the private sector so vital to the U.S. that their disruption, corruption, or dysfunction would have a debilitating effect on security, national economic security, national public health or safety.

Here, we talk to Brian Harrell about the importance of protecting critical infrastructure, the threats and hazards that pose the greatest risks to critical infrastructure and more.