Wilfried Kallenberg

Wilfried Kallenberg has extensive experience in the telecommunications sector, serving as Chief Technology Officer (CTO) at ecotel communication ag since December 2008 and as Managing Director at nacamar GmbH since July 2014. Previously, Kallenberg held the position of CTO at Callax Telecom Holding GmbH from April 2005 to November 2008 and worked as a Senior Management Consultant as a Freelancer between January 2004 and March 2005. Kallenberg's earlier roles include Executive VP Operations & Technology at access : Seven Communications GmbH, Technical Director Germany at STAR Telecom Deutschland GmbH, and Technical Manager at Worldcom GmbH. Kallenberg began a professional career as a Professional Service Engineer at SEL Alcatel AG from January 1980 to July 1994.