when a property is owned by a Trust, where can you go to find out who is behind the trust. (Example - Brady Street Land Trust) How do I know owns it?

Under Georgia law, a trust agreement is not required to be recorded.  However, a trust can not convey title to property.  The Trustee of the trust must convey title.  For example, the conveyance would be Joe Smith as Trustee for the Brady STreet Land Trust.  You might search the real estate records and see if there have been any conveyances of property owned by the trust.  Some closing attorneys record part or all of the trust agreement to put on the record that the trustee had authority to convey the property.