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Management Team

Athanasios (Tom) Stratos

Athanasios (Tom) Stratos is the CEO of Cosmote e-Value in Greece (from 2009) and e-Value International in Romania and his perspective of having the customer at the heart of every decision, led to the remarkable growth of the company, under the years of his leadership.
He serves also as Chief Customer Operations Officer, OTE Group, since 2018. He joined the Group in 1998 and since then occupied several senior managerial positions with his last position before his existing role, that of Executive Director Customer Services, OTE Group, from 2014 to 2018. Mr. Stratos has extensive Commercial experience specifically in the areas of Sales, Retail, Care and Customer Experience in the telecoms sector, having worked in large companies in Greece and Canada. Mr. Stratos holds a degree in Business Administration from Ryerson University in Toronto, Canada.

Tania Pantazi

Tania Pantazi is Commercial & International Business Development Director of Cosmote e-Value and has been in the company's management since 2004 when she took over the Commercial Division. She has contributed significantly to the growth of the company and to Cosmote e-Value’s Commercial Department.
She has more than 15 years of experience in sales and customer service, as she also worked for Lamprakis Press Group, before joining Cosmote e-Value. Mrs Pantazi holds a B.A. in Marketing & Management, from Deree College (American College of Greece).


Panagiotis Tsiantoulas is the Cosmote e-Value HR Director since May 2019. Before joining Cosmote e-Value, Panagiotis had gained more than 14 years of diverse experience through various key roles in multinational work environments. He started his career in the sales department of Diageo S.A. and then joined OTE Group in 2006, where he initially worked in the Business Process Management Division. He rotated to HR in 2010, and has since then taken on various key HR leadership roles, including PMO to the CHRO, HR Business Partner for Commercial functions and HRD Learning & Skills Manager. In 2016 he joined the Deutsche Telekom Global HRD Competence Center as the Global Head of Customer Solutions Management.
Panagiotis holds a Master’s Degree in Operational Research from Lancaster University, a Bachelor’s Degree in Business Administration from the University of Macedonia, Greece, and is certified in Change Management from Henley Business School.

Efi Alerta

As Cosmote e-Value Head of IT and Technology, Efi Alerta is responsible for all aspects of strategic IT planning. Ms Alerta, within her role, is also responsible for the management and delivery of projects across the company.
Prior to joining Cosmote e-Value in December 1999, Efi served as Information Technology Manager at a Multinational Company member of Athens Stock Market. In this role, Efi led a specialized team that provided production and project support for networks, telecommunications, and applications. Supported vastly different infrastructure and application environments. Project manager for CRM solution for organization spanning multiple locations Network management.

Dimitris Gotzaridis

Dimitris Gotzaridis serves as Head of Operations. He joined Cosmote e-Value as Operations Manager in 2009. Between 2015 and 2017, had also the position of Head of Operations in e-Value International Romania playing a vital role in the setup of the Operations in 5 different sites in Romania. Prior to Cosmote e-Value, had more than 20 years of experience in sales, service, and marketing to business and consumer customers at all levels working for companies like MRM (McCann Ericsson Group), Amstrad, JVC servicing customers like Cosmote, Vodafone, Wind. Pepsico etc.
He has an MBA with specialization in Sales Management and a BA with specialization in Marketing from Athens University of Business and Economics and Erasmus University of Rotterdam and he is completing his postgraduate studies in Management Information Systems with specialization in Business Data Analysis.

Mari Mantaka

Mari Mantaka is Cosmote e-Value Corporate Communications Manager since October 3, 2016, while she joined the OTE Group in 2001. She held several positions in Internal Communication and Public Relations (2004-2016), and prior to that she worked at the Olympics Games Department Athens 2004 and also at the Treasury Department of Cosmote.
She holds a Diploma in Digital Marketing Analytics from M.I.T. – Massachusetts Institute of Technology (Sloan School of Management). She also holds an M.Sc. in Management Studies (major in Marketing Management) from Brunel University, London and a Bachelor’s degree in Political Science & International Studies from Panteion University Athens. She also earned an accreditation in Project Management (PRINCE2) and apart from her native language Greek, she speaks fluent English, French and Italian.

Eugenia Sfyri

Ms Sfyri is Finance and Budget Controlling Manager at Cosmote e-Value Greece. She joined the OTE group in Oct 2011. Prior to joining Cosmote e-Value, Ms Sfyri worked in the financial field of Mobil Oil Hellas SA (1992-1997), in Interasco-Insurance Co as Deputy of Finance Director (1998-1999) and over the years 1999-2011, she was Financial Controller in Leo Burnett Athens. Ms Sfyri holds a Bachelor’s Degree (BS) from the National & Kapodestrian University of Athens – Faculty of Economics and she is an active member of Greek Economic Chamber.

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