Heroes of Wikipedia
For starting up the Article incubator...
A great team who proved that 10,000 new (non-vandal) editors per month left Wikipedia straight away... 
Number of active editors levelled out, and is now falling.
For acknowledging that the best Wikipedia editors often leave Wikipedia, "burnt out".
Wikipedia Chairman... 2011.
For getting the whole shebang off the ground.
The editors with the most edits.
User:Rich_Farmbrough - coder. Personality. Unambiguously British - 1 million edits
Last, but not least, Cobi: Cobi's auto-vandalism revert saves Wikipedia single-handed. It will carry on working forever... no manual intervention.
Wikimedia Foundation Outreach project volunteers - Wikipedia Ambassadors, etc.