John Paul Braddock is a UK based mastering engineer at Formation Audio and is the co-chair of the Audio Engineering Society's Mastering Group. Russ Hepworth-Sawyer is a mastering engineer for MOTTOsound, teaches part time at York St John University, UK, and is the co-chair of the Audio Engineering Society's Mastering Group. Jay Hodgson is a mastering engineer at MOTTOsound and a professor of popular music studies at Western University, Canada. Matthew Shelvock made the transformation from session musician to mastering scholar, but is currently leading business affairs for Chillhop, the well-known lo-fi hip hop radio and label. Professor Rob Toulson is a leading scholar in the field of music production and is the CEO of RTSixty Limited, the company behind music based applications such as variPlay, iDrumTune Pro, and Drummer ITP.