from the book "THE PRINCIPLES OF MASONIC LAW"
A Treatise on the Constitutional Laws, Usages And Landmarks of Freemasonry
by Dr.Albert Gallatin Mackey, 1856
It is evident from the Constitutions of Masonry, as well as from the peculiar character of the institution, that the office of Grand Tiler must have existed from the very first organization of a Grand Lodge. As, from the nature of the duties that he has to perform, the Grand Tiler is necessarily excluded from partaking of the discussions, or witnessing the proceedings of the Grand Lodge, it has very generally been determined, from a principle of expediency, that he shall not be a member of the Grand Lodge during the term of his office.
The Grand Tiler is sometimes elected by the Grand Lodge and sometimes appointed by the Grand Master.