Finding out who an email address belongs to can be accomplished by a series of small Web searches; basically, you're going to be following the clues left behind in the email address itself.The very first clue you're going to want to follow is the domain.You can usually tell when someone is up to something suspicious online, for example if you walk in a room where they are using the computer do they quickly shut it off, that type of thing.
Using the Deep, or Invisible, Web (the vast part of the Web that doesn't necessarily show up in a rudimentary Web search) to find information related to an email address can reap some impressive results.
These Invisible Web people search engines and sites can help you access more of the Web that you might not have otherwise been able to. If, after using all these different search tools you're still coming up empty, you might have to cede defeat.
Using this clue, you can navigate to the "fireplace.com" Website (or whatever website your domain is affiliated with), and do a site search for someone named Bill.
Sometimes the easiest solution can be the best one.
Finding someone's email address is not usually accomplished with just one search unless the person you're looking for has put their email address on the Web somewhere.