John IliadisPhD · CISSP · CISM · ITIL · C|CISO

About

Cybersecurity leadership, technology and a little about life beyond work.

With over 20 years of experience in designing and implementing resilient digital ecosystems that align with business goals, I am a cybersecurity executive and technology leader who drives operational excellence for organizations serving tens of thousands of clients and users.

Distinguished certifications in Management (CMgr MCMI), Cybersecurity (e.g. CISSP, CISM, CRISC, C|CISO, COBIT) and a PhD in Information Security underscore deep technical expertise and strategic vision. My track record includes architecting enterprise-wide security strategies, delivering informed risk choices towards profitable outcomes, negotiating OPEX/CAPEX efficiencies, mentoring direct reports on situational leadership and cultivating high-performing, multidisciplinary teams.

Currently leading the IT Infrastructure Business Unit at TEIRESIAS S.A., overseeing technology, pivoting complex cybersecurity challenges into innovative business-driven solutions and spearheading initiatives like the implementation of zero-trust security models and cloud migrations.

Honored to be elected to lead the engagement of the local cybersecurity community as a Board Member, Board President and Audit Chair of ISC2 Hellenic Chapter, during three consecutive terms (2021–2027), achieving growth and securing multiple national and global awards for fostering the collaboration of cybersecurity professionals across the market. As a recognized thought leader, I have authored award-winning research and am invited to deliver speeches and participate in panels at prominent cybersecurity events.

Whether delivering secure operations, shaping industry discourse or pioneering advancements, my mission remains clear: to safeguard digital services and operations while ensuring the continued success of business.

Personal interests