Ian Johnson is the author of Tributary - an open source live-coding environment designed for prototyping data visualizations with D3. He also co-organizes the SF Bay Area d3 Meetup and makes educational D3 videos.
Bay Area D3 and Tributary
The histogram is the final chart to port into the application. It will need to be bound to the data, respond to the brush's selection, and include some transitions. The first step is to get it added and positioned