About KASIS

Founded in 2014 by Siska Truyman and Raphael Stuyck: close to thirty years each on opposite sides of the digital advertising market.

KASIS is a Belgian consultancy in digital media, adtech and data, founded in 2014 by Siska Truyman and Raphael Stuyck. The name is pronounced like the Dutch and French spelling of “K6”, which is also our logo.

Two sides of the same market

Most consultants in digital advertising come from one side of the market. We come from both. Siska spent her career with media agencies and advertisers; Raphael spent his with publishers and their ad technology. Together we see a campaign the way a buyer and a seller each see it, and we use that to help both work better, and with each other.

Siska Truyman

Founder and digital media consultant. Siska was head of digital at Omnicom Media Group from 1997 to 2011. She then worked in digital marketing at Plan.Net Benelux, with Mediabrands, and as digital media consultant for Milka and Côte d’Or at Mondelēz International. At KASIS she advises advertisers and agencies on digital media strategy, planning and buying.

Raphael Stuyck

Co-founder and adtech and data consultant. Raphael has advised publishers on adtech and data since 1996. He was head of ad operations at AdLINK Media Belgium, founded the ad-ops outsourcing company S²Media, and wrote IAB Belgium’s technical guidelines in 2006. Since 2014 he has been senior adtech and data consultant for IPM Group, where he builds data, identity and AI tools for ad sales. In October 2026 he presented IPM’s Brand Matching project on stage at Piano Academy in Amsterdam. He holds the AdCP Basics certification from AgenticAdvertising.org.

Milestones

  • 1996 Raphael starts advising publishers on adtech and data.
  • 1997–2011 Siska is head of digital at Omnicom Media Group.
  • 2005–2007 Raphael is head of ad operations at AdLINK Media Belgium.
  • 2006 Raphael writes IAB Belgium’s technical guidelines.
  • 2007–2014 Raphael runs S²Media, an ad-ops outsourcing company for publishers, advertisers and agencies.
  • 2012–2014 Siska works with Plan.Net Benelux, Mediabrands and Mondelēz International.
  • 2014 Siska and Raphael found KASIS.
  • Today Identity graphs, contextual AI and AdCP agents for publishers; media strategy for advertisers and agencies.

Working with us

We are a small team on purpose. You work directly with the people who know the subject, and we bring in trusted specialists when a project needs more hands. Write to us at info@kasis.eu.

The founders

Tell us what you’re working on.

Whether you sell media, buy it or build the technology in between, write to us and we’ll get back to you.