Leonardo Borges is a programming languages enthusiast who loves writing code, contributing to open source software, and speaking on subjects he feels strongly about. After nearly 5 years of consulting at ThoughtWorks, where he worked in two commercial Clojure projects, among many others, he is now a software engineer at Atlassian. He uses Clojure and ClojureScript to help build real-time collaborative editing technology. This is his first full-length book, but he contributed a couple of chapters to Clojure Cookbook, O'Reilly. Leonardo has founded and runs the Sydney Clojure User Group in Australia. He also writes posts about software, focusing on functional programming, on his website (http://www.leonardoborges.com). When he isn't writing code, he enjoys riding motorcycles, weightlifting, and playing the guitar.