During an appearance on the Brian Lehrer Show last week, Dr. Irwin Redlener, the director of Columbia University's National Center for Disaster Preparedness, stressed that stores should be doing more to protect employees and avoid overcrowding. "We understand that people want to stock up in case there is a more serious quarantine," he said. But things like limiting the number of people allowed in a store at any one time was an "absolutely critically important thing that must be done."