well according to the modern drummer reader's polls, as of late, Mike Portnoy is the current champ.... not to say the greatest ever, but greatest right now. He has one greatest prog rock drummer for like 10 years in a row, and routinely gets best recorded performance and instructional dvd's.... so he doesnt just win for work in teh studio, he wins as a performer and as a teacher.... oh yea, and i think last year they inducted him into the hall of fame....