Arjan Middelkoop joins the SIDN team as New business, Marketing & Sales Manager

On 8 August, Arjan Middelkoop joined the SIDN team as our New business, Marketing and Sales Manager. He succeeds Sieger Springer, who has decided to take up a new challenge.

Arjan has more than twenty years' experience in marketing, communication, sales and product management at companies such as ABN AMRO, Nuon, T-Mobile, KPN and XS4ALL. In his previous roles, he was involved with a string of important innovations, including Chipknip, KPN EEN and XS4ALL's First Class proposition.


With his extensive marketing experience, his background in telecommunications and the internet, and his flair for innovation and change, Arjan can add impetus to our ambition to develop and bring to market new propositions that contribute to secure and reliable digital living.


  • Friday 19 July 2019

    Internet security

    Many users prefer convenience to security even with DigiD

    2fa 520

    E-Government Survey Report 2019 published

    Read more
  • Thursday 29 November 2018

    SIDN Labs

    DNS Privacy: DNS innovations to protect your privacy


    And the controversy surrounding DNS over HTTPS (DoH)

    Read more
  • Monday 17 December 2018

    About SIDN

    Guardian360 and SIDN team up to boost security for SMEs


    Better on-line security is urgently needed and attainable

    Read more


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