Stefan Kottwitz studied mathematics in Jena and Hamburg. He works as a network and IT security engineer both for Lufthansa Industry Solutions and for Eurowings Aviation. For many years, he has been providing LaTeX support on online forums. He maintains the web forums LaTeX and goLaTeX and the Q&A sites TeXwelt and TeXnique. He runs the TeX graphics gallery sites TeXample, TikZ, and PGFplots, the TeXlive online compiler, the TeXdoc service, and the CTAN software mirror. He is a moderator of the TeX Stack Exchange site and matheplanet. He publishes ideas and news from the TeX world on his blogs LaTeX and TeX. Before this book, he authored the first edition of LaTeX Beginner's Guide in 2011, and LaTeX Cookbook in 2015, both published by Packt.