An early adopter of Puppet, Thomas has been using Puppet since 0.24. He has given tutorials on Puppet at LOPSA conferences and spoke at PuppetConf 2013. He recently wrote the Mastering Puppet book for Packt Publishing. He has been a system administrator for almost 20 years, working primarily with Red Hat systems since 7.3, and he currently holds an RCHA. You can find him at http://ramblings.narrabilis.com John Arundel has worked in the IT industry for most of his life, and during that time has done wrong (or seen others do wrong) almost everything that you can do wrong with computers. That comprehensive knowledge of what not to do, he feels, is one of his greatest assets as a consultant. He is still adding to it. He spent much of his career working in very large corporations and, as a result, now likes to work with very small corporations. They like working with him too, not only because he can tell them about things that should not be done, but also because he can confidently inform them that big companies don't know what they're doing either. Off the clock, he enjoys gardening, competitive rifle shooting, and other gentle hobbies. You can follow him on Twitter @bitfield. If your company is small enough, you can hire him there too. Neependra Khare has more than 10 years of experience in the IT industry. He has worked as a system administrator, support engineer, filesystem developer, and performance engineer. He is an open source enthusiast and currently works at a leading open source company. You can find out more about him on his website at http://www.neependra.net. Hideto Saito has around 20 years of experience in the computer industry. In 1998, while working for Sun Microsystems Japan, he was impressed with Solaris OS, OPENSTEP, and Sun Ultra Enterprise 10000 (AKA StarFire). Then, he decided to pursue the UNIX and MacOS X operation systems. In 2006, he relocated to Southern California as a software engineer to develop products and services running on Linux and MacOS X. He was especially renowned for his quick Objective-C code when he was drunk. He is also an enthusiast of Japanese anime, drama, and motor sports, and loves Japanese Otaku culture. Hui-Chuan Chloe Lee has worked in the software industry for over 5 years. She has a master's degree in CS from the National Taiwan University and is an AWS-certified associate solution architect. Chloe is also a technology enthusiast who has extensive interest and experiences in different topics, such as application development, container technology, and Continuous Delivery. In her free time, she enjoys reading, traveling, and spending time with the people she loves. Ke-Jou Carol Hsu is an engineer at Trend Micro. As a developer working in the Data Center Service group, Carol helps to write programs for deploying or managing internal-facing systems. She has both a bachelor's and a master's degree from the National Tsing Hua University. While studying and doing research, Carol focused on the area of high performance computing and virtualization technology. The experience has made her more and more interested in system software, especially distributed systems and cloud environments.