Christoph Herrmann started to work with Unix systems, especially FreeBSD and OpenStep while he studied physics at the Technical University of Berlin. After graduation he worked as a teacher for IT and as system administrator in Berlin. Since 1999 he has worked as IT-consultant for science + computing ag. His area of responsibility covers most aspects of *nix Systems. He is creating concepts for complex computer networks, e.g. HPC Linux Clusters, large mail systems and HA solutions. He has written OCF resource agents to integrate zarafa into pacemaker/corosync.