9/11: Top lessons learned for disaster recovery

"There were huge gaps in what companies were able to do before 9/11," he said. "9/11 showed us there weren't business continuity programs [in place]. It showed us that managing your people and being able to track your people is important, [as is] being able to care for them, and ... having the employee assistance programs in place.

Working with police and other government agencies -- all that became extremely important [too]."