I've spent 20+ years building and securing network, cloud and security infrastructure for global enterprises.
Helping engineers break into cybersecurity, network engineering and cloud through hands-on courses, guides and videos, with 26,500+ already learning on YouTube.
Hands-on videos on cybersecurity, cloud, networking and homelabs, for anyone who'd rather build it than read about it.
Everything on the channel follows one idea: build to learn. I set up real labs, break them, fix them, and show every step, so you can follow along at home. Most viewers are IT pros, developers and people working towards their next certification or their first job in tech.
Two full series where I build a real lab from an empty server, one episode at a time. Every config and diagram is on GitHub so you can follow along.
Build a complete home SOC on one Proxmox server: a firewall, an attack box, vulnerable targets to practise on, a SIEM and an incident response platform, then extend it to Azure.
Design and build an enterprise network the way it's done at work, from high-level design to Cisco core and access switching, a pfSense firewall cluster, monitoring and a SIEM.
Straight from the comments on the Ultimate Cybersecurity Lab and the Ultimate Network Security Lab.
"I have learned more in this one video than I have in just about every other video on this topic combined. Very impressive and thank you for putting all this together."
"Just starting with the LAB. Please go on. I like this simple and clear step-by-step approach to building a complex LAB. Thanks"
"I've worked for 2 years in a SOC… super excited about this series. I'll be sharing these with my coworkers for sure!"
"The low-level diagram looks really professional — it's super helpful and very cleanly designed. Great job"
"I love this, to the point and easy to understand. It took me 2 days to figure out how to get the firewall connected on other tutorials!"
"…even more grateful for the quality project tutorials you've made… I look forward to completing both projects in the near future. This is some really great stuff!"
My second channel, Gerard O'Brien, is where the laptop gets closed. Big trips, daft challenges, and the slow, messy job of turning an old van into a home on wheels.
From the Khumbu valley to the temples of Japan, I film the places I go and the stories behind them, not just the highlights.
Tight budgets, random destinations and odd rules. Challenge videos around Ireland and abroad that rarely go to plan.
I'm converting an old BT van into a campervan myself: off-grid electrics with 520W of solar and around 3.8kWh of battery, water, plumbing and a full fit-out.
Brand partnerships, speaking, collaborations, or something else entirely. I read every message myself. Brands: product, goals and timeline are the big three.
