Brian,
As Victor wrote, Haggai is a NW Semitic epigraphist, a student of J.
Naveh. Among other publications, he put out a volume on the Semitic
inscriptions from Y. Magen's excavations on Mt. Gerizim.

As to the other aspects of the Qeiyafa inscription - I'm sorry but from
an ethical point of view I simply can't say anything else.

As to the inscription from Tell es-Safi/Gath. An extensive article,
with our "official interpretation" should be appearing any day now in
BASOR - so do wait to see it before you write your response ...

Best,
Aren Maeir