His official website looks spooky, Rune. I haven't heard of him either.
http://www.darrenshan.com/
His books (some are written in German):
Saga of Darren Shan
1. Cirque Du Freak (1999)
A Living Nightmare (2000)
2. The Vampire's Assistant (2000)
3. Tunnels of Blood (2001)
4. The Vampire Mountain (2001)
5. Trials of Death (2001)
6. The Vampire Prince (2002)
7. Hunters of the Dusk (2002)
8. Allies of the Night (2002)
9. Killers of the Dawn (2003)
10. The Lake of Souls (2003)
Vampire Blood Trilogy (omnibus) (2003)
11. Lord of the Shadows (2004)
12. Sons of Destiny (2004)
Vampire Rites Trilogy (omnibus) (2004)
Vampire War Trilogy (omnibus) (2004)
Vampire Destiny Trilogy (omnibus) (2005)
Demonata
1. Lord Loss (2005)
2. Demon Thief (2006)
Novels
Koyasan (2006)