How can I modify Search results page

I am not sure if this is a Global Site Search or Indexer plugin question, but here goes...

I want to remove the avatar table column as well as the "username wrote:" text from the results page of a global site search. I only want the page title and the excerpt that shows up. What would be the best way to approach this?

Background info:
I am working on a "userless" website, meaning multisite is being used to departmentalize information and there are no real "bloggers" but rather a few people managing contact everywhere.