
If there is no such information (visible or not) and you can’t find any other information about the identity of that person or company in the posts of the blog ask the owner. He or she may tell you or not, it depends of several things like liking the final results or not and their current relations. If you don't find out even then search the blog using a search engine like Tor, Google or Bing. Some web designers have portfolio with the designed websites and they may have added the blog in the list.