Javier Domingo Cansino got started in University with the open source community and got specialized in Git source code management and several Linux tools.

Through his Git knowledge, which he gained by working on Gitolite projects from the very beginning, he helps people to have a correct Gitolite installation together with appropriate workflows.

With several developments during his career in various languages, and knowledge on kernel networking design, now he is developing in C and Python. He can be found over the Internet under the nickname "txomon".

milki is a recent graduate from the University of California, Berkeley, and now works as a software engineer at Yelp, Inc. in San Francisco, California. During his university years, milki mastered Git and FreeBSD as a software developer and a system administrator. milki contributes to the open source project Dulwich, which is a pure python implementation of the Git file formats and protocol. milki also maintains the FreeBSD port of Gitolite, ensuring Gitolite remains free of Linux-specific code. On freenode IRC, milki can be found in #git, #gitolite, and #github, providing users with general advice from Git basics and troubleshooting to best practices and Git internals.

Hiren Patel is an assistant professor in the Electrical and Computer Engineering department at the University of Waterloo, Canada. His research interests are in embedded software and hardware systems. This includes models of computation, real-time systems, computer architecture, and system-level design methodologies.

Giovanni Toraldo is an open source enthusiast with in-depth knowledge about system administration, cloud computing, and web application development. He currently works as a lead developer for ClouDesire.

In the past, he wrote OpenNebula 3 Cloud Computing and reviewed Mastering Redmine for Packt Publishing.