Hi There--thanks for the reply. Unfortunately I don't have any other information. Hopefully soon I'll be able to make it to the NJ archives in Trenton, NJ to possibly see John Doerr's death certificate (as well as his wife Kate's). I only have the information that I have from my father, who got it from his father, etc. My father's father knew that they were from what is now referred to as Germany but I don't have any further information.
Best,
Jennifer