Surname Saturday: Hartmann

Do I seem a little focused on this name this week? Well that is because I'm examming the records I have with a fine tooth comb. I have found some errors I have made, because I didn't know better. Like I noticed I have 3 spellings of my Great Grandmother's last name, and I never listed her with an AKA (also known as). So, I'm meaning my evil ways. Thanks Heavens to the classes I took at the Family History Expo, I learned so much and I can move on armed with new knowledge, but I digress.
The information I have on my Great Grandparents came from a cousin of my Dad's cousin Fred. I never knew any of my Dad's cousin but somehow I wrote him out of the clear blue sky and he answered me. It's a two page single spaced typed letter. Tomorrow when I do some scanning I'm going to scan into my computer. There I go digressing again.
In a nut shell I know:
Joseph Hartmann born in Germany about 1865, New Info Sept 1845, Immigrated 1868, died in USA, most likely the NYC in 1915.
First wife was Susanne Neff, Naef, Naff, no dates and no places. Second wife was Kati Wyland or Wieland Maybe Whitenheim, who died in 1920s. He had six children, I guess with Susanne. New Info, all from Susanne.
Peter born about 1883
Fredrick about 1885 died 21 march 1930 wife Catherine P. Ashenbrenec
Emma born about 1887 died before 1919
William born about 1889 died 13, Jan 1954 wife Catherine
Helen born 1893 and died 1938
George Joseph my grandfather born 20 April 1891, Married to Mary Jirak on 29 Dec 1911in Long Island City, Queens, New York, USA. died 17 Nov 1943 Flushing , Queens, New York, USA.

As you can see I have a lot of research to do!!