He was climbing with Summitclimb. Details here:
http://www.everestnews.com/everest2010/summitclimbeverestnorth06012010.htm
That said -- being on the Summitclimb team doesn't necessarily means you're guided... Summitclimb offers tired services to the Himalayas. The base price is peak permit and yak/porter support to BC, then you add on what additional services you want like O2, usage of fixed ropes, personal porters etc..