David Bryant Copeland is a programmer and author. He wrote "Build Awesome Command-Line Applications in Ruby", and has been a professional developer since 1995. He's managed high-performance, high-traffic systems at LivingSocial, helped build the engineering team at Opower, and worked consulting gigs both large and small. Currently, he's Director of Engineering at fashion start-up Stitch Fix, building a platform to change the retail shopping experience.