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 (Cypher Commander). He also plays bass in black metal bands Ajattara (under the alias Tohtori Kuolio) and Deathchain (under the alias Kuolio). He has named Ozzy Osbourne and Chuck Schuldiner as his favourite musicians.