Lebowski is a level 60 master engineering trainer and vendor located at Honor Hold in the contested territory of Hellfire Peninsula. He is located outside the keep, right of the entrance. ("He is located off the path, to the right, as you enter the keep.")
See List of Hellfire Peninsula NPCs.
Trivia[]
His name, together with Lua error in package.lua at line 80: module 'Module:Factiongfx/faction_tip_link.json' not found. 
Zebig, is a play on a well known movie "The Big Lebowski".