The person behind this is Carsten Zimmermann, a Berlin-based web-developer and *nix-shell lover. I've been working in IT engineering and consultancy since the beginning of this millenium, focussing on Ruby and Ruby on Rails since 2008. I am an evangelist for everyday IT security. I like free and open-source software and I have a thing for teaching stuff.
Also, I am a freelance developer and consultant.