About Me

Hi, I’m Jeroen.

I got hooked in 1987. I was eight, we had a Commodore 64, and fairly soon I was more curious about how the games were made than about playing them. I started peeking at the source code of my favourites, and my parents signed me up for a BASIC course. That was that.

At 15 I took a holiday job at International Computer Products, building computers. The holiday job turned into four years, and by the end I was running their systems. In 1996 I set up my first Citrix WinFrame environment there, so colleagues in other countries could work together over dial-up modems. I was also one of the first people in the Netherlands on a high-speed internet connection, which felt like the future back then.

At 19 I became a consultant and spent the years after that building and fixing Citrix environments all over the Netherlands. I saw a lot come and go: Citrix buying Ardence, RES PowerMenu, Softricity SoftGrid turning into App-V, NetScaler joining the family, and the slow goodbye of Novell and GroupWise, which I still have a soft spot for. In 2014 I joined Citrix, where I worked as a Senior Technical Relationship Manager: the technical point of contact for enterprise customers across EMEA.

In 2017 I started my own company, Tielen Consultancy, and moved my focus to Nutanix.

These days my work is a mix of consultancy and training. I’m still the only Nutanix certified instructor in the Benelux, so I teach the official courses, and in between I design, build and troubleshoot environments for customers. End user computing never went away: a lot of that work is virtual desktops and apps, mostly Citrix, often running on Nutanix, with Microsoft 365, Azure, Intune or a PKI somewhere in the picture as well.

I’m also a Nutanix Technology Champion and I lead the Nutanix User Group in the Netherlands. I started it in 2021, back when it was a virtual meetup. Around 2022 we switched to in-person events, with about eight people in the room. These days we get around sixty.

And I speak at events about what I learn in the field. I have given sessions on Community Edition at Nutanix .NEXT, at the Nutanix User Group in Belgium and at E2EMVC 2025 in Lisbon.

I also do a lot with Nutanix Community Edition. It is what my own lab runs on, and most of what I learn there ends up on this blog as CE tips and tricks. Installing CE by hand over and over got old, so I built the CE Automated Deployer: a small tool that turns the manual install into one bootable ISO that sets up AHV, the CVM and Prism Element on its own, with Prism Central if you want it.

This blog is where I write down what I run into along the way: guides, scripts and field notes. Partly so I don’t have to figure things out twice, and partly because someone else is probably stuck on the same thing. If a post helped you, or if I got something wrong, leave a comment.