![Willem Fredrik Sijthoff](data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="%231b1b1b" class="bi bi-person-fill" viewBox="0 0 16 16"><path d="M3 14s-1 0-1-1 1-4 6-4 6 3 6 4-1 1-1 1zm5-6a3 3 0 1 0 0-6 3 3 0 0 0 0 6"/></svg>)
Willem Fredrik Sijthoff was the founder of Sijthoff Media Groep BV, established in 2010, and held the title of Chief Executive Officer.
Former job includes Director at NHST Holding AS.
| Sociétés | Poste | Fin |
|---|---|---|
Sijthoff Media Groep BV
 Sijthoff Media Groep BV Internet Software/ServicesTechnology Services Operates as a media publishing and professional information company | Directeur Général | - |
| NHST HOLDING | Directeur/Membre du Conseil | - |
Actives
Inactives
Sociétés cotées
Entreprise privées
| Entreprise privées | 2 |
|---|---|
NHST Holding AS
 NHST Holding AS Publishing: NewspapersConsumer Services Publishes business newspapers | Consumer Services |
Sijthoff Media Groep BV
Sijthoff Media Groep BV Internet Software/ServicesTechnology Services Operates as a media publishing and professional information company | Technology Services |
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