According to Ray Franz, a former member of the WT Governing Body, his uncle, Fred Franz was the main architect of the NWT Bible, a man who described himself as "largely self-taught" Evidently Fred Franz studied an Arts degree course at the University of Kentucky for 2 years [1912-1914] before he quit. During that time he did 2 years of Latin, but had no formal training in any of the Bible languages, Koine Greek, Hebrew, or Chaldee.
For these languages he taught himself, apparently unaware of the old adage, "The person who teachs himself has a fool for an instructor"
From other sources, it appears that at least 6 other men played a peripheral role: Nathan Homer Knorr, Hayden Covington, Milton Henschel, George Gangas, Grant Suiter, and Albert Schroeder, all of whom are now deceased.
The WTS, however has never officially released the name of the Translation Committee
Cheers