"What year did Tilly work at Glen Ridge? Was it before or after Park?"
From what I can glean from Dean and this thread it looks like, at this point, what the club or anyone else knows, the architectural/architect chronological evolution of the course at its present site goes pretty much like this (at this point);
1. Perhaps R. Thompson and membership on the original routing and design (1911, 12, 13-15)
2. Willie Park Jr, apparently around 1918
3. Tillinghast, apparently in the early 1920s, apparently redid at least two holes (par 3s?)
4. RTJ, a member, 1970, redid the 9th due to tennis
5. About five years ago, Forse Design with a restoration led by club member Dean Paolucci.
If there is more on the architectural/architect evolution of the course from 1911 until now I'm not aware of it and the foregoing is the way Dean pretty much laid it out to me.
However, I think Dean knows all the particulars of why Tillinghast and RTJ worked on the course, when and what specifically they did. If that's true and there is some good photographic evidence both before Tillie and before RTJ, I believe, at this point, it is very possible to just back out the Tillie and RTJ changes and then compare the changes to the course (seemingly in a number of ways) against that March 28, 1915 article and diagram (particularly the hole by hole descriptions) that Joe Bausch found, and in that manner it should to some pretty good degree of accuracy show what and what-all Willie Park Jr did at Glen Ridge GC.
It appears to me some land might've been sold off fairly early on like the second half of the original 4th, the 5th and the 7th and a bit of land may've been picked up on the northeast corner on the other side of the road from the clubhouse. And the original 17th is gone and the 16th was turned from a par 4 into a par 3 (17th) presumably by Park.
To me the most interesting Willie Park Jr stuff to look at will probably be considerable resequencing, some altered bunkering and bunker patterns from the hole by hole descpritions of bunkers and greenshapes and sizes in that 1915 article and some green building or rebuilding.