I can't remember who did the redesign (nor could I find it on line), but the course was closed for two years (I think 1994-5). I want to say Arthur Hills, but it wasn't him. As I remember, it was some guy from Virginia or North Carolina -- not a big name but one that would be recognizable (i think he's also no longer living).
For what was accomplished during the renovation, I don't know why the course remained closed for two years. I think all the fairways and greens were re-seeded. The greenside pond in front of the par 5 seventh was extended so a carry over water is required. Strategic options are limited as it is near impossible to go for the green in two-- even with a great drive, players must lay up with a 6 iron or so -- thus making it the 2nd worst par 5 I have ever played (with the worst being #10 at Balamor in NJ).
The tee on 14 was moved. The old hole was a blind dog leg left to a down hill - punchbowl-like green. The new tee is elevated and replaces the dog leg with an awkward and somewhat difficut down hill drive-- a 3 wood is probably the correct play there.
As the previous poster noted, the downhill par 3 sixteenth is a new hole. The current driving range is the old 16th. It used to be a short par 4 (300 yards or so) just as you crossed over route 218 and played back toward the club house.
While short at just over 6,000 yards, it does play a bit longer. Without doubt the hilliest course i have ever played.
The architecture is pretty good given the terrain -- I have played the course about 20 times, but not since 2005 -- I can only remember one "cookie cutter" RTJ hole -- that being the par3 eleventh hole.