Stefan Kottwitz studied mathematics in Jena and Hamburg. Afterwards, he worked as an IT Administrator and Communication Officer onboard cruise ships for AIDA Cruises and for Hapag-Lloyd Cruises. Following 10 years of sailing around the world, he is now employed as a Network & IT Security Engineer for AIDA Cruises, focusing on network infrastructure and security such as managing firewall systems for headquarters and fleet. In between contracts, he worked as a freelance programmer and typography designer. For many years he has been providing LaTeX support in online forums. He became a moderator of the web forum http://latex community.org/ and of the site http://golatex.de/. Recently, he began supporting the newly established Q&A site http://tex.stackexchange.com/ as a moderator. He publishes ideas and news from the TeX world on his blog at http://texblog.