A couple of further points, which apply to the UK - the USA may be different.
My understanding is that copyright falls under what are known as Intellectual Property rights. These rights can be transferred to another person but I am advised that it is preferable to have such an agreement drawn up professionally.
The other point is that ownership does not mean that you have the IP rights. These remain with the creator for a period of 25 years. So I assume that even though you may own a hard copy of a photo, if you benefit from it financially in any way, the creator is the person entitled to such benefits.
I strongly recommend to anyone publishing such an image/photo to state the creator as the copyright owner.
If the copyright owner does not have an email address, and one of my contacts didn't even own a computer, you can use your own address but still state his copyright. Similarly if they don't wish for some reason to receive any contact, again grant them copyright but use your own address.
Malcolm.