I guess the guy might be more well known for using to be the long time singer of Borknagar. Glad you enjoy it, happy to help. I recommend The Focusing Blur for avant/prog metal and Solens Rötter as his most well balanced album
On Vintersorg: most his albums are super melodic, folksy, catchy black/symphonic metal. My favourite album though is The Focusing Blur, an expereimental prog/black album entirely about quantum physics