From Pollak:

At a morning staff meeting, Greg Jamison told those gathered at HP Pavilion that he is stepping down as the CEO and president of Silicon Valley Sports and Entertainment while remaining part of the ownership group.

No successor was immediately named.

The owners set the tone of the organization, choose which upper level executives (like the GM) to hire and fire, and very generally decide what kind of team hits the ice.  That mantle of power will change to a new person, so the near and long term fortunes are the Sharks are much more uncertain today than they were yesterday.  Could change for the better, could change for the worse.  We could get a John McDonough, who has done very good things for the Blackhawks, or we could get a Charles Wang, who has basically run the Isles into the ground.