1. When did the Richard Arnold "era" actually begin. What were the earliest TOS novels that showed his influence? I seem to remember that he was in place as early as Vulcan's Glory. Is that true and if so were there earlier novels that he influenced?
It seems to me, by certain comments in "Voyages of Imagination", that Richard Arnold was probably asked to read drafts of the novelization of ST IV. Vonda McIntryre got increasingly frustrated with it, and has said so in public. Up until then, Susan Sackett was vetting licensed tie-in material for Roddenberry. (Certainly, she is on record for having done all the Bantam approvals.) In the early 80s, Richard was a part-time volunteer tour guide at Paramount (and may well have been reading material to lighten Sackett's load).
His paid position of Star Trek Archivist was made possible after the huge profits of ST IV.