Jane Mackay is one of those people who can spell any obscure English word you can imagine, and she's saved my professional butt more times than I can count. With her diligence, Medusa is able to produce works of high quality. There are NO spelling errors in a Medusa book (well, none Jane missed. Sometimes things happen in the design department -me and Rick- that she doesn't know about, but we discuss that now).
Here is a link to her website, for those who also need a grammar and spelling perfectionist.