OUR TEAM
Yiannis Koukouras
Managing Director
Yiannis has over 20 years of experience in the Cyber Security domain, specialising in the consulting services area. He started his career as a network security administrator and member of the CERT team at the Corps of Computing and Research of the Greek Army. He then went on to offer IS consulting services to various companies across the globe, gaining valuable, hands-on experience. Yiannis has partnered with some of the leading Information Security companies in the EMEA region and has accrued knowledge in working across different regions and industries, both on the field of security management and information security assurance.
Responding to the opportunities presented by the growth of the ICT sector worldwide , Yiannis founded TwelveSec in order to bring together a team of seasoned pen-testers and security consultants that share the same passion for innovation and attention to detail. These days Yiannis is working tirelessly so TwelveSec can be recognised as one of the top Information Security firms on a global level.
His academic qualifications include a BEng in Electronic Engineering from the University of Lancaster and an MSc in Computer Systems Security from Glamorgan University, Wales. He also holds some of the most widely acclaimed certifications in the industry, such as CISSP, CISA, CISM, ISSAP and OSCP. Yiannis is an affiliate and member of ISACA, (ISC)2, and of the Hellenic (ISC)2 chapter. Yiannis has also volunteered as the coach of the Greek Cyber Security National Team.
Yiannis Koukouras
Managing Director
Our valiant leader, el jefe, the infallible being, the creator, and the majority shareholder.
In 2012 he founded TwelveSec and brought together a team of experts whose main means of entertainment is to point out his mistakes.
During his youth he somehow convinced two respectable academic institutions to award him both a bachelors and a masters degree. But his days of deception do not end there; numerous organisations arguably went bonkers and gave him industry specific certifications like CISSP, CISA, CISM, and OSCP to name but a few of his victims.
Finally, we have to warn ISACA, (ISC)2, and OWASP that they have a master deceiver in their midst.
George KaragianNidis
George is a Senior Information Security Consultant at TwelveSec. George is a seasoned pen-tester, having accumulated a wealth of experience from performing, as well as leading, Information Security projects that range from System/Network/Web Application Penetration Tests to Reverse Engineering, Security Design and Architecture of critical Information Systems, and Information Security Management System (ISMS) implementation.
George has been involved in Information Security projects across different industries, including major Greek and Middle-Eastern banks, Telecoms providers, the European Commission and the US Health sector. He is interested in all the latest developments in the security industry, keeping pace with the latest cutting-edge technologies and techniques that allow him to find innovative solutions to the complex puzzles posed by the ever-evolving ICT sector.
George KaragianNidis
The XO, the almost infallible being, the heir to the throne, and a minority shareholder.
One of the originals, the eldest member of the Operations Department, he is well loved by his minions as they will definitely tell you themselves if you meet them when they are allowed out from the dunge… I mean during their coffee break.
Finally, I won’t do him justice if I do not mention his award winning micro management techniques. And who in his right mind doesn’t love constant micro management.
Ioanna Dima
Senior Information Security Consultant
Ioanna is a Senior Information Security Consultant at TwelveSec with nearly a decade of hands-on experience in Information Security Management, Governance, Risk, and Compliance (GRC), complemented by more than ten years of prior experience in the banking sector focusing on credit risk and fraud control.
Since joining TwelveSec in 2017, Ioanna has led and delivered dozens of high-impact security management, compliance, and auditing engagements across the globe.
Her expertise spans ISMS and QMS implementation and auditing (ISO/IEC 27001, ISO 9001, ISO 22301, ISO 27701, ISO 20000-1), regulatory compliance (NIS2, GDPR, DORA, PCI-DSS), AI Impact Assessments (ISO/IEC 42005), and risk assessments (ISO/IEC 27005, NIST CSF 2.0, ITSRM).
She has supported major European agencies and global institutions (including eu-LISA, EUAA, ECHA, and UNESCO), UK government departments, national ministries, financial institutions, healthcare providers, telecom operators, and international technology firms.
Ioanna holds a BSc in Business Administration, a BSc in Philosophy, Education & Psychology, and a Diploma in Forensic Psychology & Criminology. She is a PECB Certified ISO/IEC 27001 Lead Auditor, ISO/IEC 27001 Lead Implementer, and Data Protection Officer (DPO), has completed training in NIS2 Lead Implementation and CISSP, and is an active member of the Hellenic (ISC)² Chapter.
Ioanna Dima
Senior Information Security Consultant
Bend the knee for the undisputed Queen of Compliance, the High Priestess of ISO 27001, and the only person at TwelveSec whose academic background legitimately qualifies her to psychoanalyse why you still haven’t updated your Risk Register.
Before joining TwelveSec in 2017, Ioanna spent a decade in banking, where she learned that people can’t be trusted with money, and a stint teaching high schoolers, where she learned that people can’t be trusted with anything.
Naturally, she decided to combine Business Administration, Philosophy, Psychology, and Forensic Criminology to pursue her true calling; hunting down missing policies and non-conformities across European agencies, ministries, and corporations.
While the pen-testers are busy breaking things for fun, Ioanna is the one making sure the rest of the world and TwelveSec itself (she wrote our own ISMS and QMS) follows the rules.
If a regulation has an acronym (GDPR, NIS2, DORA, NIST, ECHA, ADAE), she has already audited it, mapped its maturity, and politely informed management why their “temporary workaround” from 2019 is an existential threat.
Her threat model?
Undocumented processes, unapproved exceptions, and anyone who thinks “we’ll fix it before the surveillance audit” is a valid security strategy.
Fun fact!
With a diploma in Forensic Psychology & Criminology, she doesn’t even need to check the audit logs during an internal audit, she already knows you’re lying about your patch management cycle just by the way you’re blinking.
Phil Kaloheretis
Phil is responsible for ensuring that everything runs smoothly within TwelveSec.
Being the head of two departments he is putting his considerable experience to the test every day.
When he is not involved in projects within his departments, he tries to find ways to help the company grow.
He holds a BSc in Sociology and an MBA.
Phil Kaloheretis
The top bean counter of TwelveSec.
When the upper management wants to blame someone, he is there to take the fall.
It is always safe to bet into people’s love for accountants.
To Phil’s defence he started his life with dreams of being a respectable sociologist, it is sad that he decided later on to join the Dark side and get an MBA.