Jens Bergensten (née Thornell). Jens Bergensten Jens "Jeb" Bergensten is a Swedish video game designer. Since December 2010, he has worked for the video game developer Mojang as a programmer and game designer. He became the lead designer and lead developer of the indie sandbox game "Minecraft", after Markus "Notch" Persson stepped down from his position in December 2011. He is known by his in-game name "jeb_". Bergensten started programming his first games at age 11 using BASIC and Turbo Pascal. By age 21, he was a mapper and modder for the first-person shooter "Quake III Arena". Later he worked as a
Minecraft mods owners more control over their "Minecraft" environments. With the release of the alpha version, the first client-side mods began to appear; these added relatively simple things, like other textures or amendments to the in-game compass. Towards the end of 2010, new mods were released which featured more content than previous ones. "Minecraft" was now preparing to move into its beta development phase, and popular mods such as "IndustrialCraft", "Railcraft" and "BuildCraft" were first released to the public. As opposed to their predecessors, these mods had the potential to change the entire game instead of simply tweaking minor aspects of it.