In my opinion Jack Vance beats pretty much any combo of ‘big three.’ He’s still kicking too, he’s 96. Last novel was 2004.
Here’s a fairly recent article:
http://www.nytimes.com/2009/07/19/magazine/19Vance-t.html?pagewanted=all&_r=0
Freegards
bump
Vance is great..Green Majic got me hooked
Free speculative fiction has tons of great
books for free