Hubert Klein Ikkink is also known as mrhaki. He uses his alias to write on his blog “Messages from mrhaki” (https://blog.mrhaki.com/). On this blog he writes short tips and tricks about Groovy, Grails, Gradle, Spock, Spring and Asciidoctor. Today he works with Java and Groovy during his daytime job at JDriven in the Netherlands.
He also wrote books on Gradle, published at Packt Publishing and spoke at different conferences and meetups.