500 characters don't make justice in proving how awesome Simon is. I'd need way more characters than that!
Simon has been a Release Engineering employee for over 2 years. He made great improvement in the way Firefox partial updates are generated, in making the Firefox release promotion process more rock solid, and in knowing what resources Releng uses. On top of these great skills, Simon's wordplays are always à propos :)
An automatic vouch for being a Mozilla employee.