As the legend goes, the early days of the life of the wasteland builder known simply as Artorious were spent in service of The Brotherhood of Steel. It is unknown whether he was an original member of the Appalachian Brotherhood or if he came over with the West Coast Brotherhood. Either way it is common knowledge that he was enlisted in their ranks at one time.
In the Brotherhood Artorious was an applauded inventor that could take pre-war technology and craft marvelous new mechinations from it. Obviously this was of great value to the BoS. But apparently something happened which soured Artorious against his Brotherhood, enough to make him walk away completely from them and go rogue, taking his inventive genius with him as he left.
Now free, Artorious spends his scientific creativity crafting some of the most awe-inspiring creations in the wasteland!