Jens Peder Bergensten, also known as Jeb, or jeb_ by his in-game nickname, is a Swedish video game designer. Since December 2010, he has worked for the game developer Mojang as a programmer and game designer. He became the lead designer and lead developer of the popular indie sandbox game Minecraft, after Markus "Notch" Persson stepped down from the positions in December 2011.[1][2]