John IliadisPhD · CISSP · CISM · CRISC · C|CISOCOBIT · ITIL · CMgr MCMI

About Dr. John Iliadis — Technology & Cybersecurity Executive

20+ years directing cyber operations and resilient digital services.

Executive summary

Dr. John Iliadis is a technology and cybersecurity executive currently serving as IT Infrastructure Director at TEIRESIAS S.A. in Athens, Greece, where he directs a team of 18 professionals delivering cyber operations, 24/7 service resilience and technology leadership for mission-critical financial services serving tens of thousands of clients.

Professional experience

With over 20 years of experience designing and operating resilient digital ecosystems, the work spans cybersecurity strategy, secure architecture, cloud transformation, zero-trust adoption, AI governance and regulatory alignment — connecting security posture with business risk appetite and measurable outcomes. Selected quantified achievements include a 37% improvement in service availability (current role), 85% improvement in disaster recovery readiness, and zero-downtime infrastructure migration for tens of thousands of users.

His career began in information-security research, progressed through applied security R&D and enterprise infrastructure engineering, and evolved into technology and cybersecurity leadership spanning cyber resilience, risk, governance and digital transformation.

Education & credentials

Distinguished credentials in management (Chartered Manager, CMgr MCMI) and cybersecurity (CISSP, CISM, CRISC, C|CISO, ISSMP, CCSP, COBIT, ITIL, DPO Executive) reinforce a PhD in Information Security and an MSc from Royal Holloway, University of London.

Board & community leadership

Elected to lead community engagement at ISC2 Hellenic Chapter across three consecutive terms (2021–2027) — as Board Member, President of the Board (2023–2025) and current Chair of the Audit Committee — driving significant measurable growth: chapter membership +20%, social-media following +24% (and +100% in the prior term), event attendance +80%, sponsorships +150% and speaking invitations +50%. The chapter received national and global recognition including the Global Achievement Award for the EMEA Region (ISC2, 2022 and 2024) and multiple CyberSecurity Leadership Awards (Boussias, 2022–2026). Currently serving as Advisory Board Member for the MSc in Law and Information & Communication Technologies at the University of Piraeus (2025–present).

Research & publications

As a published researcher and invited thought leader, John has authored over 30 articles and research papers on cybersecurity strategy, CISO leadership, cyber risk, AI governance and cloud security, and has delivered keynotes, opening speeches and panel moderation at major cybersecurity conferences in Greece and across EMEA.

Professional Profiles

Personal interests