Tenn. Code Ann. § 66-5-104: Execution by agent or attorney

Instruments in relation to real or personal property, executed by an agent or attorney, may be signed by such agent or attorney for the principal, or by writing the name of the principal by that person as agent or attorney; or by simply writing the agent's or attorney's own name or the principal's name, if the instrument on its face shows the character in which it is intended to be executed.