Jonathan Hobson is a server engineer, developer, and database administrator who, for more than 20 years, has been working behind the scenes to support companies, organizations, and individuals around the world to realize their digital ambitions. As a keen exponent of Linux in the workplace (including RHEL, Fedora, Debian, Ubuntu, Mint, and many more), he has been using CentOS since its inception, and as the author of the best selling book CentOS 6 Linux Server Cookbook, Packt Publishing, he maintains a strong reputation for the generation of ideas, problem solving, building business confidence, and finding innovative solutions in challenging environments.

Beyond this, Jonathan enjoys writing code, publishing articles, listening to music, and walking his dogs in the great outdoors.

Manikandan Somasundaram has more than 3 years of experience in the field of Linux administration. He has a Bachelor of Engineering degree in Computer Science. Being a Linux enthusiast, he has specialized as a Red Hat Certified Engineer (RHCE) and Red Hat Certified Security Specialist (RHCSS). He is very interested in security implementation on servers. He started his career as a Systems Engineer in Linux in a small Chennai-based start-up company, where he had the freedom to explore/implement the world of open source. He migrated a number of software from proprietary to open source, such as the Openfire intranet chat server. He then moved to SafeScrypt, a business unit that is a part of Sify Technologies Limited, which is India's first certificate authority (CA), where he had an opportunity to work with the PKI infrastructure and certification practices. This helped him relate his RHCSS studies to reality. Currently, he is working for Mindtree Ltd. as a Linux system administrator and pursuing a Master's degree in Software Systems from BITS Pilani, India. His main hobby is to do freelance training on Linux administration. His other hobbies include yoga, martial arts, gymnastics, and playing the guitar.

He has previously reviewed Implementing Samba 4, Packt Publishing, and is happy that he got an opportunity to review this book as well.

Ahmet Fuat Sungur is an experienced computer engineer working with Global Maksimum Data and Information Technologies, a company that provides consultancy services on many products of Oracle (CEP, Coherence, database, DW, data mining), HP (Vertica), and Software AG (Apama and Terracotta).

He has around 8 years of IT experience working in the telecom and consultancy industries. He has worked on several products; they have changed over a period of time but the underlying OS has not. As an operating system engineer, he has worked especially on Oracle Enterprise Linux, Red Hat, and CentOS for several years.

Software architecture, distributed processing, Big Data, and columnar databases are his other main interests. He is also the reviewer of Getting Started with Oracle Event Processing 11g, Packt Publishing.