There are two artists that go by the name of Olaf:
1) Olaf despite his scandinavian alias comes from Ukraine and exercises himself in all the way death metal. Being influenced much by Necrophagist, Sceptic, Arsis and Death of course, a deep feel of melodics and doom are traced though. By the way, all the teeth-grinding riffs and blowing drumming is performed by himself.
2) And also there's this dutch kid named Olaf Wisselink making some very good ambient music.