I have a Louis Horwitz in my family too. He was my paternal grandfather's brother. I have no idea when he was born, when he immigrated to the US or where he lived. My pgf was Bernard Louis Horwitz, parents were Moses Horwitz and Birdie Behrman (sp?). Birdie abandoned the family for another man and soon after Moses died, leaving the boys orphans. I don't know much about exactly where they came from, except that my pgf said it was "5 miles from the German border", close to or in Lithuania.