Authorised signatories

Wilfried Kallenberg (CTO)


Wilfried Kallenberg (born in 1960), has been working for ecotel communication ag since 2008. As Chief Technical Officer (CTO) and authorised signatory he is responsible for IT, Network Operation, Product, System and Network Engineering, and Process and Project Management. Since 2014 in his function as Managing Director he has been instrumental in the successful realignment of the 100 % subsidiary nacamar GmbH. After his vocational training at SEL AG and other qualifications he first worked as a professional service engineer. In 1994, when the liberalisation of the telecommunications market became apparent, Wilfried Kallenberg switched from the system provider to the telecom network operator WorldCom (now Verizon). Subsequently, the network and IT expert performed technical and operative functions for other carriers and service providers.


Holger Hommes (CFO)


Holger Hommes (born in 1977) has been working for ecotel communication ag since 2014; first as a business manager and since September 2016 as Chief Financial Officer (CFO) and authorised signatory. Besides group controlling and reporting he is also responsible for Financial Accounting, Controlling, Billing and Technical Purchasing. After completion of his degree in sales administration (at a university of applied sciences) in 2000 he began his career in auditing with Arthur Andersen and Ernst & Young, before he switched to the Deutsche Telekom group in 2006. There he held different positions with responsibility for the consolidated financial statements and reporting, including three years in charge of the financial statements for the subsidiaries.