Minecraft wiki entry for Petr_Mr%C3%A1zek, associated text: Petr 'peterix' Mrázek is a member of the Minecraft: Java Edition development team at Mojang Studios, since June 2018.[1] He was announced on May 14, 2018.[1] He was hired to work on the Minecraft Launcher, especially on Linux. He is known for creating MultiMC, which he continues to develop.[1]