Profile
Greg Day is SVP & CISO at Cybersecurity Wisdom and a respected cybersecurity thought leader with more than 35 years of industry experience. He has been active in cybersecurity since its earliest days, developing an early EDR solution and serving in consulting and senior CTO/CISO roles at organizations including Dr. Solomon’s/McAfee, Symantec, FireEye/Mandiant, Palo Alto Networks, and Cybereason. Greg has led extensive cyber transformation initiatives, SOC and incident response programs, and threat and forensics training. He works closely with public sector and Global 2000 organizations on cybersecurity strategy—spanning risk, AI, IoT/OT, operational resilience, and security consolidation—as well as policy and regulatory frameworks such as GDPR and the EU NIS Directive.
Expertise
- Incident Response
- Securing AI and AI in Cyber Security
- Cyber Security Strategy
- EMEA Regulations
- Deep Product & Vendor Expertise in Endpoint, Network and Cloud Security
Qualifications
Achievements & Contributions
- Previously held board and advisory roles with the World Economic Forum Center for Cybersecurity, Europol, the UK National Crime Agency, the Council of Europe, TechUK, and the I‑4 CISO community, including service as Chair and Vice Chair
- Helped found the UK Cybersecurity Information Sharing Partnership (CISP)
- Former member of the NATO Threat Advisory Board
- Built and led a global threat intelligence community of 50+ organizations and nations at Palo Alto Networks
- Top-rated speaker at leading industry events, including WEF, RSA Conference, Gartner, IDC, InfoSec, and Black Hat
Certifications & Credentials
- UK CLAS Consultant
- Former UK SC Security Clearance