Raoul-Gabriel Urma is a PhD in Computer Science at the University of Cambridge. His research centers on programming languages and software engineering. He has worked for large companies such as Google, eBay, Oracle, and Goldman Sachs, as well as for several startup projects. He's an author of the upcoming book "Java 8 Lambdas in Action". In addition, he is a frequent speaker at Java developer conferences and is also an instructor for Java courses.