Mr. Coren has been involved with open source for a while. He open-sourced an autocomplete component (created using Adobe Flex) while working for M5, which had wide adoption in the Flex developer community. It was this experience which led him to open-sourcing Invoice Ninja.
Full episode at twit.tv/floss506
You can find more about TWiT and subscribe to our full shows at https://twit.tv/shows/