Digital advertising, seen from both sides.

We are a Belgian consultancy in digital media, adtech and data. Between us, we have spent close to sixty years on opposite sides of the market: one of us with media agencies and advertisers, the other with publishers. Every project gets both points of view.

Email us What we do

What we do

Some of our work is for the buy side, some for the sell side, and more and more of it sits in between.

For advertisers and agencies

Digital media strategy

Advice on digital media strategy, planning and buying, partner selection and campaign measurement, from someone who ran digital at a major media agency group for fourteen years.

Learn more about digital media strategy

For publishers and sales houses

Adtech and monetization

Ad server set-up and ad operations on Google Ad Manager, programmatic and header bidding, ad formats and yield. From the first audit to day-to-day operations.

Learn more about adtech and monetization

For both sides

Data, identity and consent

Audience data platforms and segments, identity resolution, contextual targeting, consent management (IAB TCF) and analytics, wired into the ad stack so the data reaches the campaigns.

Learn more about data, identity and consent

AI and agentic advertising

Private AI tools for ad sales and ad operations, and agents built on the Ad Context Protocol (AdCP) that let buyers’ and sellers’ agents plan and trade media directly.

Learn more about AI and agentic advertising

How we work

Hands-on

We don’t stop at recommendations. We set up the ad server, build the data pipeline and write the tools ourselves.

Close to the Belgian market

We have spent our careers with Belgian publishers, sales houses, agencies and advertisers. We know the market, its players and how they work together.

Ready for the next shift

We have been in digital advertising since 1996, from the first ad servers to programmatic and privacy rules. Today we build with AI agents and AdCP.

Selected work

Contextual AI, identity graphs and agentic advertising, built and run in production.

All case studies

Belgian media group · AI · contextual targeting

Contextual targeting built from a brand’s identity

An AI tool that turns a brand brief into a contextual segment on a publisher’s articles. In a video A/B test: 40.8% lower cost per completed view.

Insights

Notes on digital advertising, data and AI agents, from both sides of the market.

All insights

Who we are

KASIS was founded in 2014 by Siska Truyman and Raphael Stuyck.

Portrait of Siska Truyman

Siska Truyman

Founder, digital media consultant

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

Siska on LinkedIn
Portrait of Raphael Stuyck

Raphael Stuyck

Co-founder, 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, and he holds the AdCP Basics certification from AgenticAdvertising.org.

Raphael on LinkedIn

Companies we have worked for and with

  • Omnicom Media Group
  • Mediabrands
  • Plan.Net Benelux
  • Mondelēz International
  • IPM Group
  • Ads & Data
  • Pebble Media
  • Davidtrading
  • AdLINK Media
  • IAB Belgium

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.