--- title: PCI DSS 4.0 | Adam Gaydosh description: As a Director of PCI Services at Online Business Systems with over 20 years in the security industry, Adam has worked to grow our PCI practice and other offerings in Cybersecurity, including as a member of Online’s PCI Steering Committee. Adam has been a QSA since 2008 and has performed assessments across a wide range of industries and technologies, with a focus on cloud. Adam has expertise in numerous other regulatory standards, risk assessment and security governance, and earlier in his career performed network and web application penetration tests, forensics and network security integration. In addition to being a QSA, Adam is also a certified 3DS Assessor, as well as holds his CISSP and CISA. --- [![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 Services](https://info.obsglobal.com/hubfs/dig-trans-cons-1.png) ##### [Digital Advisory 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![](https://info.obsglobal.com/hubfs/b2b%20ecommerce%20icon.png) ###### B2B eCommerce ![](https://info.obsglobal.com/hubfs/Financial-Services-Icon.png) ###### Financial Services Contact ![](https://info.obsglobal.com/hubfs/ContactUs_Contact-Us-Form.png) ###### Contact Us ![](https://info.obsglobal.com/hubfs/ContactUs-Locations.png) ###### Locations × # PCI DSS 4.0 | Adam Gaydosh # Our Blog The Online Blog is a source for insights, resources, best practices, and other useful content from our multi-disciplinary team of Onliners. 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 ## Adam Gaydosh As a Director of PCI Services at Online Business Systems with over 20 years in the security industry, Adam has worked to grow our PCI practice and other offerings in Cybersecurity, including as a member of Online’s PCI Steering Committee. Adam has been a QSA since 2008 and has performed assessments across a wide range of industries and technologies, with a focus on cloud. Adam has expertise in numerous other regulatory standards, risk assessment and security governance, and earlier in his career performed network and web application penetration tests, forensics and network security integration. In addition to being a QSA, Adam is also a certified 3DS Assessor, as well as holds his CISSP and CISA. [mailto:agaydosh@obsglobal.com](mailto:agaydosh@obsglobal.com) ![Picture of Adam Gaydosh](https://info.obsglobal.com/hubfs/Adam1.jpg) #### All Posts from Adam Gaydosh [![](https://info.obsglobal.com/hubfs/Multi%20Tenant%20Service%20Providers-2.png)](https://info.obsglobal.com/pci-dss-4.0/multi-tenant-service-providers) 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) ##### [Understanding the Changes to Appendix A1: Multi-Tenant Service Providers](https://info.obsglobal.com/pci-dss-4.0/multi-tenant-service-providers) By [Adam Gaydosh](https://info.obsglobal.com/pci-dss-4.0/author/adam-gaydosh) on April 21, 2022 Are you a SaaS? Do you offer various shared services to merchants and other service providers with access to resources or services being logically controlled or partitioned to keep... 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