Welcome to this week’s installment of Security Pros on Twitter. Today we turn our attention to an expert in a very important area of compliance, PCI DSS – the Payment Card Industry Data Security Standard – in addition to his other areas of security expertise. Branden Williams is the Director of the PCI Practice for Verisign, a global security consulting firm. He also maintains a Verisign blog focused on a range of security topics: Branden Williams’ Security Convergence.