Vlastimil Holer is a systems engineer who focuses on automation. He has worked with Unix-like systems for more than a decade, and he first used Puppet in 2008 while preparing and managing the growing deployment of the GoodData cloud BI on Amazon EC2. Currently, he is working on the CERIT Scientific Cloud project at Masaryk University, where he manages and automates the computing, cloud, and storage infrastructures.

Ashish Kumar Jaiswal has been working for the past 4 and a half years and has worked on Puppet for almost 4 years. Puppet was the root cause for the growth of his technical career.

He is currently working on a project called obmondo.com—an "Operations as a service" project—using Puppet to automate server configuration and management. This project sets up the whole Puppet infrastructure without a Puppet server, and it's just far off to click on the profile you want your server to have.

Amar Krishna is a DevOps professional and loves to automate everything that comes his way. He has used Puppet and scripting for automation. He started his career with Linux and PHP and moved on to high-performance computing, where he worked with one of the largest clusters in India. Then, he moved on to the cloud computing world, where he worked on tools such as CloudStack and OpenStack. He was involved in one of the biggest cloud projects in India. Currently, he is working at Reliance Jio Infocomm.

This was his first book as a reviewer and he loved it. He would like to review more books in the future.