Juha Harju (born 1981 in Kuopio) is a Finnish heavy metal musician. He was the vocalist of the Finnish dark metal/black metal band Shade Empire and dark-metal band Chaosweaver (Cypher Commander). He also plays bass in black metal bands Ajattara (under the alias Tohtori Kuolio)^[1] and Deathchain (under the alias Kuolio). He has named Ozzy Osbourne and Chuck Schuldiner as his favourite musicians.