People
Arjen Lentz was employee#25 at MySQL AB, responsible for the MySQL Manual (2001-2004), global Community Relations (2004-2006), MySQL Users Conference (2005-2006), teaching MySQL Training courses (2001-2007), and MySQL Support Engineering (2006-2007). Arjen also co-authored the upcoming 2nd edition of O'Reilly's High Performance MySQL book. Originally he is a C programmer, with coding experience going back to the early 80s.

Arjen founded Open Query in September 2007.
Arjen's blog on LiveJournal
Arjen's profile/bio and references on LinkedIn

Jonathon Coombes founded Cybersite Consulting in 1997, providing a range of services. More recently Cybersite has focused on enterprise data management using open source tools and knowledge.
Jonathon's profile/bio and references on LinkedIn