It was Ed Dunlap.
From CoC (4th ed.), p.5:
The third man is Edward Dunlap, who was for many years the
Registrar of the sole missionary school of Jehovah’s Witnesses, the
Watchtower Bible School of Gilead, also a major contributor to the
organization’s Bible dictionary (Aid to Bible Understanding [now
titled Insight on the Scriptures]) and the writer of its only Bible
commentary (Commentary on the Letter of James). He expressed
his difference of viewpoint on certain teachings only in private conversation
with friends of long standing. In the spring of 1980, a committee
of five men, none of them members of the organization’s Governing
Body, met with him in secret session for a few hours, interrogating
him on his views. After over forty years of association, Dunlap was
dismissed from his work and his home at the international headquarters
and disfellowshiped from the organization.
The whole Commentary of James episode is discussed in the book.