Chris Mason Of Btrfs Is Leaving Oracle Written by Michael Larabel in Free Software on 7 June 2012 at 10:53 AM EDT. 2 Comments Chris Mason, the lead developer of the Btrfs file-system, is parting ways with Oracle. Chris Mason announced this morning he is leaving Oracle. Chris Mason has been apart of Oracle's Kernel Team for years where he worked full-time on the development of the Btrfs file-system