Jospeh "Joe" Simmons (also known as Young Joe) is an assassin, known as a "looper", for the mob in the future. His targets are people sent back through time by the mob to be killed by these loopers so there is no trace of the murder or the victim ever exsisting in the Mob's timeline. Young Joe is the protagonist of the 2012 film Looper. He is portrayed by Joseph Gordon-Levitt.
Not much is known about Young Joe's life before becoming a looper other than he was a reckless and homeless orphan ( at one point in the film it is hinted that he saw his mother killed). He spent most of his childhood on the streets living any way he could, until he was found by Kansas City crime boss Abe, after he was caught robbing a mob owned watch store. Abe saw potential in Joe and taught him the tricks of the trade. Eventually Abe "put a gun in [Joe's] hands" and helped him begin his career as a looper for the present day and futuristic Mob.