This isn’t all that difficult to do, as long as you have the full email address you can start your search with a few basic databases. Usually these databases will lead to other joined information and it’ll be able to create a profile of the person you want to find out, it might take a while because well your basically going into detective mode here, i found a few websites that might help you out here, the best of them is this one though, thought i’d save you the trouble.
http://bit.ly/gDIjgE