I first learned about Andreas from seeing one of his videos about TempleOS [1][2] when I was first playing with TempleOS and learning (Holy)C. There are a few forks of TempleOS around, I made a post about one a couple months back. [3]

1. https://www.youtube.com/watch?v=Wr3xN52QYtA

2. https://www.youtube.com/watch?v=VkF7pQpgm50

3. https://news.ycombinator.com/item?id=29513856