About us


Read about the people behind Unless.

unless office 2000px

From left to right in the picture, we present you the humans behind Unless.

Sander Nagtegaal

Sander is co-founder and CEO at Unless. Previously, he was CTO at myTomorrows (Balderton Capital, EQT Ventures, Sofinnova), co-founder and CTO of Peecho (Peak Capital), CTO at Sumis (acquired) and Chief Architect at Albumprinter (acquired).

He lives on an old ship with his pet snail, teaches a weekly kung fu class and is a competitive obstacle racer.

Ecesu Erol

As the latest addition to the team, Ecesu is involved in both marketing and sales. Also, she is great at organizing anything festive!

Marcel Panse

As a CTO and co-founder, Marcel leverages his experience as Chief Architect and lead developer at Peecho and several other start-ups like Albumprinter and myTomorrows.

When he doesn't try to solve complex problems with elegant solutions, he loves to climb rocks or spend time with his family.

Yvonne Koleczek

Before making Unless look cool with her wicked marketing skills, Yvonne was marketing manager in the publishing world and growth hacker at myTomorrows.

Rogier Trimpe

Rogier is all about the hustle! Rogier used to be a business developer at Optimizely and founded Interactly, while at Unless he is responsible for sales.