I have tracked my Great Great Grandfather back to Semeschitz or the near area. His father was listed as Anton and his mother as Katharina. He had a cousin named J W Müller who was from Teinitz and had a furniture factory in Vienna later in life (1890's) Johan (John) Haas moved to Milwaukee, WI in the 1860's and died there in the 1890's.
Where is the best place to start researching this?
Thanks in advance.