Barbara Hohensee has worked as a network administrator for more than 10 years. Among others, she worked for Daimler Chrysler Research. She is well-versed with the most commonly used operating systems such as Unix, Linux, Windows, Mac OS, Android and iOS. In 2001, she published her first article, "Linux auf dem VTech Helio" (Linux on VTech Helio) which is reasonably priced PDA on which Linux can be installed. If you want to re-live the nostalgia, here is the link to this article: https://sites.google.com/site/barbarahohensee/books-articles In addition to courses for networks and Linux, she has developed and taught programming courses for Perl and Java. At present, she devotes time to her new-found love - Android programming.