Peter Bone
From JuggleWiki
Peter holds the unofficial world records for 11 and 12 balls (18 and 13 catches respectively) and is the only person to have ever flashed 13 balls. His main goal is to qualify 11 balls but he also does siteswaps with 3-8 balls, club balancing and head bouncing while juggling, and up to 7 clubs.
He has a website with some videos and juggling software: http://www.geocities.com/peter_bone_uk/juggling

