Moll was born to a German father and a French mother. After spending his childhood in Germany, Moll studied film at the City College of New York and the French National Film School (IDHEC). He then worked as assistant editor, editor and assistant director, among others with Marcel Ophuls and Laurent Cantet. His debut feature film, Intimité, was released in 1994. In 2000, his second feature film, Harry, He's Here to Help, was screened in official competition at the Cannes Film Festival. His third film, Lemming, was chosen to open the Cannes Film Festival in 2005.