Category:Photographs by G. W. Allyn

After some research, I have reasonably inferred that "G. W. Allyn, M.D." was most likely George Washington Allyn (1845-1921).

http://pic.nypl.org/constituents/311608 https://findagrave.com/memorial/38699541/jessie-lydia_m-allyn https://www.findagrave.com/memorial/45811045/george-w-allyn