Well, I obviously don't come directly here often, though I have done a lot of work on the tree.
No concrete luck in getting more information on Heinrich (Hinrich) Kunnmann (Künnmann) though I am now working with a Künnmann in Germany on his tree which has promise of meeting up with this tree in time.
Karl Hr. Künnmann has some details:
b. 02 Sep 1902 in Cuxhaven, Germany
d. 11 Aug 1939 in New York, NY
--- Killed in Brooklyn on that date.
dep: Germany : 16 Oct 1923
Arr: USA: 26 Oct 1923
Declaration to naturalize:14 May 1924
Order of Admission: 8 Aug 1929
Petition for Naturalization: 11 Jan 1929