David brings more than 20 years of experience working with and on open source projects in industries including aerospace, video games, and web, both server and client side. For the last decade he has focused on privacy enhancing technology, user anonymity and anti-surveillance. Most recently he was a senior platform security engineer at Mozilla where he focused on web privacy and led the project to merge Tor Browser hardening into Firefox. He is now the Security Maven at Hyperledger, the open source blockchain project hosted by The Linux Foundation.