There is more than one artist known under this name:
1) Stephen (born 13 December 1991), formerly known as Stephen Swartz, is an American electronic music artist, singer-songwriter, and producer based in Joshua Tree, California. He is known for his song "Crossfire" and his cover of Adele's song "Hello". He is also known for making a collaboration with Pell and Caleborate in the song, "In the Morning".
Stephen's debut album, Sincerely, was released on May 10, 2016.
2) Stephen is a mexican alternative band which was formed in 2004. They have released one album named "Monsters Are Real". The band and the first album name was picked after Stephen King's quote: "Monsters are real, ghosts are too. They live inside us, and sometimes, they win."
3) Stephen was Clean member David Kilgour, former Goblin Mix bassist Alf Danielson, Geoff Hoani, and Stephen Kilroy joined on second guitar. The group disbanded part of the way through recording an album at Stephen Kilroy's Fish Street studio. David rejoined The Clean and eventually recorded his solo LP, while Alf and Stephen went on to form Chug.