Bastian Bleeck
Managing Director

Tel.: 0228/98 98 2-0
E-Mail: b.bleeck@koellen.de

Stefan Vogel

Editorial office of specialised magazines

Tel.: 0228/98 98 2-23
E-Mail: s.vogel@koellen.de

Monika Möbius
Advertising management

Tel.: 0228/98 98 2-80
E-Mail: m.moebius@koellen.de

Max Freyn
Marketing & Sales

Tel.: 0228/98 98 2-87
E-Mail: m.freyn@koellen.de

Frederic Brandenburg
Editors of specialised books

Tel.: 0228/98 98 2-84
E-Mail: f.brandenburg@koellen.de