Here's the company's chief security officer, Hemu Nigam.

NPR: MySpace Moves to Protect Kids

"It's part of this overall story that the Chinese want to know what the West thinks of them, " said Richard Bejtlich, chief security officer with the computer-security company Mandiant Corp.

WSJ: Chinese Hackers Hit U.S. Media

Richard Bejtlich, chief security officer at Mandiant, a computer-security company, said that in cases handled by his firm where intrusions were traced back to Chinese hackers, 94% of the targeted companies didn't realize they had been breached until someone else told them.

WSJ: U.S. Outgunned in Hacker War

Mikko Hypponen is chief security officer for F-Secure, a leading computer security company.

BBC: Viewpoint: Stuxnet shifts the cyber arms race up a gear

Bruce Schneier, a security expert and chief security-technology officer at U.K.-based telecommunications company BT Group PLC, said one shouldn't assume that Zappos and Amazon have the same or similar security structures, despite their corporate relationship.

WSJ: Zappos Says Customer Database Hacked

"We keep an eye on all this stuff so that the clinician can do what she needs to do without fearing for her safety, " said Tom Flanagan, a retired police officer and president of Accord Detective Agency, a company that provides security for Advocate's nurses.

CNN: Nurses dodge bullets to provide care