Hubert Klein Ikkink, born in 1973, lives in Tilburg, the Netherlands, with his beautiful wife and three gorgeous children. He is also known as mrhaki, which is simply the initials of his name prepended by "mr". He studied information systems and management at Tilburg University. After finishing his studies in 1996, he started to develop Java software. Over the years, his focus switched from applets to servlets, and from Java Enterprise Edition applications to Spring-based software and Groovy-related technologies. He likes the expressiveness of the Groovy language and how it is used in other tools, such as Gradle. He also wrote Gradle Effective Implementation Guide, Packt Publishing.

In the Netherlands, Hubert works for a company called JDriven. JDriven focuses on technologies that simplify and improve the development of enterprise applications. Employees of JDriven have years of experience with Java and related technologies and are all eager to learn about new technologies. Hubert works on projects using Grails and Java combined with Groovy and Gradle.