Our Team

Management

Dr. Dimitris Derpanis

Founder & President, D GROUP



Dr. Dimitris Derpanis is one of the few people who is not asked to choose between military discipline, academic depth and business vision, but on the contrary, he harmoniously combines them into a coherent, continuously evolving path.

Graduating from the Military Academy of the Hellenic Army in 1993, he served the Hellenic Army for almost three decades, attaining the rank of Colonel. As a staff officer of the Defense War Planning Command (DASP), he participated decisively in key military exercises and international NATO conferences, invaluable experiences that have shaped the way he thinks and makes strategic decisions to this day.

At the same time, he built an equally solid academic presence. He was awarded a PhD from the University of Piraeus in Decision Sciences, holding master’s degrees from the Athens University of Economics and Business and the National Technical University of Greece. He dedicated thousands of hours to teaching, notably his contribution to the distance learning undergraduate program in Business Administration at Frederick University, a collaboration that went beyond academic boundaries. The unbreakable bonds of trust forged with Frederick now constitute the core of a shared, great ambition: the establishment of a new university in Greece, a pioneering project which both sides aim to implement in the near future.

Practically and mentally, Dr. Derpanis radically diverges from established norms, as he masterfully combines entrepreneurial genius with social progress and the well-being of the masses. During his career in the private sector, he demonstrated rare negotiating skills, landing international agreements that brought to Greece recognized foreign language certifications from leading global bodies such as OCN London, while leaving his indelible mark as co-founder and CEO of UNICERT.

Today, as Founder and President of D GROUP, he leads a multi-dimensional group with a strong footprint in education, certification, consulting and construction. His most ambitious project is called U RESORT, a plan to radically transform the Vasilitsa National Park and Ski Resort, with the aim of making it an international tourist all year-round destination. This particular project bears a deeply personal mark: Vasilitsa belongs to Grevena, his hometown, therefore its rebirth constitutes for him a supreme act of service.

What makes Dr. Derpanis special is not just the vast breadth of his experience, but the way he transforms it into action. With authenticity, boundless enthusiasm and the rare ability to inspire absolute trust, he manages to transform strategic thinking into a tangible, collective result.

Zoi Chatzi

Vice President, D GROUP



Zoi Chatzi brings with her something rare: the discipline and determination built over 27 years of military leadership, and the flexibility of a person who recognizes opportunities where others see uncertainty.

She graduated from the Nursing Officers School (1998) and completed her academic training with a degree in Sociology (Panteion), a specialization in Nursing Pathology and a MSc in Health Unit Administration. She served in high-pressure positions — ICU at 424 GHQ and 401 GHQ — as well as at the highest echelons such as the General Staff and the Hellenic Navy, retiring in 2019 with the rank of Lieutenant Colonel (EA).

Her tenure as Director of the Army Day Care Center (A BSNA) was noteworthy, where she introduced innovative educational programs inspired by Scandinavian models, substantially strengthening the relationship between child, family and education.

In 2019, she did what few dare: she left behind a stable, distinguished career and turned to the private sector — not out of necessity, but because she saw early on where the next development opportunities lay. At UNICERT, she successfully developed and managed the distance learning programs of Frederick University, while also contributing as an ISO inspector. She then took on a decisive role in D GROUP, assuming the presidency and legal representation of the UCERT certification body, participating in the establishment of Theater 10Θ drama school and leading strategic initiatives in ISO, marketing and new technologies.

Today, as Vice President of D GROUP, Zoi Chatzi turns experience into results and inspiration into strategy. She has the ability to sense the change before it happens — to understand what is coming and to position Group where it needs to be. She is the type of leader who combines rigor with humanity, and vision with action.

Christiana Mantalvanou

Head of Marketing & Communications

Aristeidis Chronakis

Head of Technology

Sofia Moutafi

Legal Councel

Dimitris Siamantas

Commercial Manager

Ntina Kouremada

Head of Accounting Department

Eleni Vatsikouridi

Office Administration Director

Kelly Manitara

General Manager

Paraschos Kampageorgiou

Quality Management Manager

Katerina Trivizaki

Academic Program Sales Manager

Dimitra Dokopoulou

Education Consultant

Valia Zampekou

Head of OCN London Examinations

Ioannis Karanikas

General Manager

Froso Korrou

GENERAL MANAGER

Dimitris Kouroumpalis

Academic Director

Yiannis Litos

CEO

Athanasios – Foivos Berdos

Director of Strategy & Development

Alexios Soukas

General Manager

Fragkiskos Drongitis

General Manager