David Heinemeier Hansson, also known as DHH, is a Danish software engineer, programmer, writer, entrepreneur, and racing driver. He is the creator of Ruby on Rails, a web framework written in Ruby. He is also a partner and chief technology officer at the web-based software development firm 37signals. Hansson co-wrote Agile Web Development with Rails with Dave Thomas in 2005 as part of The Facets of Ruby Series. He also co-wrote Getting Real, Rework, Remote, and It Doesn't Have to Be Crazy at Work with Jason Fried. Source: Wikipedia (en)