I don't think anyone's ever found the original architect for the original version of Mosholu GC. It sprang up shortly after VanCortlandt, and one of the clubs-without-real-estate who moved to Mosholu from VC were appropriately named "The Mosholu Golf Club".
So, MGC gets constructed and before long the city decides to turn it into 18 holes to meet the demand. A newpaper account from the era said this about the new construction, and identified the architect as "Chairman Johnson of the Player's Committee":
The 'new' Mosholu was laid out like this:
and the 1924 aerial of the course syncs up with the diagram:
It's been surmised that the course was impacted by highway construction, not so, but Van Cortlandt was. It's also been thought that John Van Kleek had a hand in the 1914 -16 version of MGC, but that also seems implausible as I don't believe he began 'architecting' until 1924, or thereabouts. He may have done some 'touch-up' work on it after he went to work for Robert Moses in 1929, but the 1951 aerial doesn't show that he did much.
And it doesn't look anything like the other work he did at the time, like a complete overhaul of Forest Park in 1934:
FP, pre-Kleek:
FP, post-Kleek:
And bunkers like this one at Split Rock, during the same time period:
Mosholu has a 'new' life now (Steven Kay reconstruction, First Tee), and it's nice to see a 100+ year old club that's still in existence