AUTHOR BIO Paul Chiusano has been writing and shipping functional code in Scala since 2008 and is responsible for the introduction and growth of Scala usage at his company, Capital IQ. As part of this effort he co-designed a functional programming curriculum with Runar and taught an internal course for coworkers interested in learning FP. Paul is also a regular blogger and speaker on functional programming and Scala. Runar Bjarnason is a self-taught programmer with 12 years of industry experience, with a focus on functional programming since 2008. Runar is a prolific blogger and occasional speaker on functional programming and the Scala programming language. He is a principal contributor to the Scalaz library for Scala and the Functional Java library for Java.