Marek is an experienced system architect and Linux administrator. He specializes in security and virtualization. His work as an active open-source contributor can be found in projects like Linux kernel, Linux-HA, Xen, and, of course, Qubes OS. Marek holds a master’s degree in computer science from the University of Warsaw.

Piotr Król is an open-source firmware enthusiast who founded 3mdeb in
March 2015. His expertise is rooted in the hacker ethos of collaborative
innovation and transparency, guiding 3mdeb's focus on projects like
Zarhus OS, a Yocto-based Embedded Linux distribution, and Dasharo, a
coreboot downstream project. These projects are dedicated to open
development, embedded firmware resilience, platform security,
transparency, the right to repair, and digital sovereignty.

Piotr's deep involvement in open-source firmware includes key computing
areas such as Root of Trust, Secure, Verified and Measured Boot, TPM,
coreboot, UEFI, EDK II, Yocto, U-Boot, and Linux. He often speaks at
significant industry events like FOSDEM, Xen Developers Summit, and
Platform Security Summit, sharing his insights and promoting the
open-source firmware ecosystem. Piotr is dedicated to sharing knowledge
by serving as a Trainer at OpenSecurityTraining2, offering free and open
educational materials to advance the open-source firmware ecosystem.