My favourite soundtrack he has done was for The Ring. The movies aren't my favourite, but his music was definitely chilling. Below, I have linked a very beautiful piece that he wrote for it. It is the only song in the OST that wasn't meant to be scary.
This is a song called Shelter Mountain.
http://www.youtube.com/watch?v=BGKdZir3ObEThis one is called Let the Dead Get In. It is a remix of Shelter Mountain that has it's own awesome elements. I am a big fan of both. The contrast of these two songs compared to the rest of the OST is staggering.
http://www.youtube.com/watch?v=eXChmgtuIKg