Ken Kousen is a Java Champion, Oracle Groundbreaker Ambassador, and Grails Rock Star, and the author of the books Kotlin Cookbook (O’Reilly), Modern Java Recipes (O’Reilly), Gradle Recipes for Android (O’Reilly), and Making Java Groovy (Manning). He is a regular speaker on the No Fluff, Just Stuff Tour, and teaches training classes in areas related to Java, including Spring, Hibernate/JPA, Groovy, Grails, Gradle, and Android.