In the wake of the highly-publicized PlayStation Network hack, Sony began scouting for network security experts to beef up its infrastructure -- and, no doubt, improve its image. Now Sony has appointed a new chief information security officer, whose previous background includes Microsoft and the US Department of Defense.

Philip Reitinger was director of the US National Cyber Security Center, reports Reuters. At Sony, he'll be a senior vice president. For their part, Sony hasn't made any bones about the reasons for the new hire. "Certainly the network issue was a catalyst for the appointment," said a spokesman. "We are looking to bolster our network security even further."

Sony shares have taken a 55% hit since the hacking, in spite of gains the PlayStation Network userbase has made. Sony was caught unprepared for the hack, as it hired three separate network security and forensics firms in the weeks following the intrusion. Having an in-house expert overseeing security operations should obviously bolster the company's efforts, next time another crisis arises.