1082. When Professor McGonagall took over as Headmistress she was out Defense Against the Dark Arts, Transfiguration and Muggle Studies professors, a Head of Gryffindor house, and a Deputy. It was then that Arthur and Molly Weasley approached her and offered to help. Arthur quickly became a favorite as Muggle Studies professor and Molly taught DADA and Head of Gryffindor for the next twelve years. McGonnagal made a shocking choice in Professor Trelawney as her Deputy- a job she excelled at more than Divination.