Need help on some genealogy things?

-I am stuck on a great great great grandfather that came from Germany to Missouri. he did his doctor in Missouri and worked as a doctor. his name was frank schowdngerdt. if anyone can help me out on where i may also search for him like doctor search in 1800s or census in Germany. any help would be great thanks.If you know the town he was from there's probably records that are easily located. However if you don't know the town I'd contact the German consulate in a large city like Los Angeles or New York to ask them for genealogy organizations that might be able to help.
I am not seeing that surname with that spelling anywhere at all. I checked Family search and Mocavo and neither had even a record with that surname in Germany or the US. Could there be a different spelling?
Who were the kids? Dates? Any other clues?

The closest I could find is Schoengerdt.