David Griffiths is an Agile coach and software developer. He began programming at age 12, after being inspired by a documentary on the work of Seymour Papert. At age 15 he wrote an implementation of Papert's computer language LOGO. David has written various books in the Head First series, including Head First Android Development (1e and 2e) and Head First Kotlin, and created The Agile Sketchpad video series with Dawn.