Anyone who has VLC Media Player or similar programmes who's taken a recent look at the .ogg files in the 'rsrc -> sound -> music' area will know that 'boss.ogg' will magically rename itself to 'Boss music, Harry Mack' when played.
It also used to display a picture from the SK Soundtrack Volume 1 cover, but no longer! Take a look again!
If that isn't Harry Mack, then who is this mysterious man who has infiltrated Spiral Knights?
Totally not a conspiracy theorist,
Raisinfist.
It turns out that this picture is of Harry Mack Foster, who is probably not the composer of the SK soundtrack, but someone unrelated.
So, what is a picture of him doing there? Maybe a friend of someone in the SK developer crew? Who knows?