You asked me previously if GB spoke with an accent; no, he was definitely a native American speaker, though his language was very old-fashioned and rather peculiar, probably originating somewhere in the northeastern United States.
Annasmom, I know this sounds silly, but when I read your description of GB's accent, I think of Thurston Howell III. I used to think of Mr. Howell whenever I heard William Buckley speak, too.
Was GB's accent anything like that, or if not, can you think of a famous person he sounded like?