P. Tomas Delvechio is an IT programmer with nearly 10 years of experience. He completed his graduation at Luján University, Argentina. For his thesis, he started to research big data trends and gained a lot of deep knowledge of the MapReduce approach and the Hadoop environment. He participated in many projects as a web developer and software designing, with PHP and Python as the main languages. In his university, he worked as an assistant for the subject computer networks and taught courses on Hadoop and MapReduce for distributed systems subjects and academic conferences. Also, he is a regular member of the staff of programmers in the same institution. In his free time, he is an enthusiastic user of free software and assists in the organization of conferences of diffusion on it.

Swapnil Salunkhe is a passionate software developer who works on big data. He has a keen interest in learning and implementing new technologies. He also has a passion for functional programming, machine learning, and working with complex datasets. He can be contacted via his Twitter handle at @swapnils10.

Parambir Singh is a JVM/frontend programmer who has worked on a variety of applications in his 10 years of experience. He's currently employed as a senior developer with Atlassian and is working on building their cloud infrastructure.

Jenny (Xiao) Zhang is a technology professional in business analytics, KPIs, and big data. She helps businesses better manage, measure, report, and analyze big data to answer critical business questions and give better experiences to customers. She has written a number of blog posts at jennyxiaozhang.com on big data, Hadoop, and YARN. She constantly shares insights on big data on Twitter at @smallnaruto. She previously reviewed another YARN book called YARN Essentials.