--- title: PCI DSS 4.0 | Clark Dixon description: As an Information Security Consultant at Online Business Systems, Clark is part of an industry leading team of security professionals. Clark has a diverse and wide-ranging set of experiences with many different technologies. Clark has been in the PCI assessing trenches since 2015 after a 20-year run in operations. This run included desktop, server, network and telephony management as well as many facets of operations encompassing accounting & budgeting, training, and the implementation of cloud and end to end premise-based solutions. As a QSA, Clark employs a pragmatic, risk-based security mindset. Clark’s involvement in the information security practice includes focus on PCI compliance as well as HIPPA, NIST, and ISO assessments. This involvement has included Fortune 500 organizations as well as smaller, private firms. In addition to compliance assessments, Clark has participated in numerous accounting and business operations audits. Clark holds QSA, CISSP, & CISA as well as AWS and Azure certifications and MCSE, CCNA and CNA legacy designations in addition to a degree in finance from SDSU. --- [![Online Business Systems](https://info.obsglobal.com/hubfs/OBS%20+%20CGI%20LOGO%203.png)](https://www.obsglobal.com) Toggle navigation About ![](https://info.obsglobal.com/hubfs/About-Our_Approach.png) ###### Our Company ![](https://info.obsglobal.com/hubfs/Our-Community-Icon.png) ###### Our Community ![](https://info.obsglobal.com/hubfs/Executive-Team-Icon.png) ###### Executive team ![](https://info.obsglobal.com/hubfs/About-Partners.png) ###### Partners & Clients ![](https://info.obsglobal.com/hubfs/Imported%20sitepage%20images/About-News.png) ###### News ![](https://info.obsglobal.com/hubfs/Imported%20sitepage%20images/About-Events.png) ###### Events Services ### [DIGITAL TRANSFORMATION](https://www.obsglobal.com/digital-transformation/digital-advisory-services) ![Digital Advisory 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Topics include Security, Service Management, Customer Experience, Technology and Business Consulting, and Cloud.   ## Understanding the Changes to Appendix A1: Multi-Tenant Service Providers [Continue Reading](https://info.obsglobal.com/pci-dss-4.0/multi-tenant-service-providers) ## Roles and Responsibilities | Who's Driving What? [Continue Reading](https://info.obsglobal.com/pci-dss-4.0/pci-roles-and-responsibilities) ## Incident Response - Unexpected PAN Identified [Continue Reading](https://info.obsglobal.com/pci-dss-4.0/incident-response-unexpected-pan-identified) ### Get latest articles directly in your inbox, stay up to date Subscribe to our blog ### Topics - Select a Topic ### Stay up to date Subscribe to our blog ### Subscribe Here! - [Blog](https://info.obsglobal.com/pci-dss-4.0) - / - Author ## Clark Dixon As an Information Security Consultant at Online Business Systems, Clark is part of an industry leading team of security professionals. Clark has a diverse and wide-ranging set of experiences with many different technologies. Clark has been in the PCI assessing trenches since 2015 after a 20-year run in operations. This run included desktop, server, network and telephony management as well as many facets of operations encompassing accounting & budgeting, training, and the implementation of cloud and end to end premise-based solutions. As a QSA, Clark employs a pragmatic, risk-based security mindset. Clark’s involvement in the information security practice includes focus on PCI compliance as well as HIPPA, NIST, and ISO assessments. This involvement has included Fortune 500 organizations as well as smaller, private firms. In addition to compliance assessments, Clark has participated in numerous accounting and business operations audits. Clark holds QSA, CISSP, & CISA as well as AWS and Azure certifications and MCSE, CCNA and CNA legacy designations in addition to a degree in finance from SDSU. [mailto:cdixon@obsglobal.com](mailto:cdixon@obsglobal.com) ![Picture of Clark Dixon](https://info.obsglobal.com/hubfs/Clark-Dixon.png) #### All Posts from Clark Dixon [![](https://info.obsglobal.com/hubfs/Monitor%20the%20Monitoring.png)](https://info.obsglobal.com/pci-dss-4.0/monitor-the-monitoring) tags [PCI](https://info.obsglobal.com/pci-dss-4.0/tag/pci) [PCIDSS4.0](https://info.obsglobal.com/pci-dss-4.0/tag/pcidss4-0) [PCIDSS](https://info.obsglobal.com/pci-dss-4.0/tag/pcidss) [PCI DSS v4.0](https://info.obsglobal.com/pci-dss-4.0/tag/pci-dss-v4-0) ##### [Monitor the Monitoring](https://info.obsglobal.com/pci-dss-4.0/monitor-the-monitoring) By [Clark Dixon](https://info.obsglobal.com/pci-dss-4.0/author/clark-dixon) on April 21, 2022 There are two notable changes that may require a fair bit of runway to fully meet the existing requirement to monitor your critical security control systems. 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