David Heinemeier Hansson

37signals and Ruby on Rails. Heinemeier Hansson wrote Basecamp's code and in 2004 released the framework underneath it as open-source Ruby on Rails, which let tiny teams build web applications quickly and later underpinned Shopify, GitHub and many small software firms. As co-owner and technical chief of 37signals he champions running software on owned servers to keep costs down. His outspoken views divide people.