I don't know anything about Jerry Koehler. He could possibly be some relative of mine. My great grandfather Fred M. Hilpert had a half sister, Justina Knipfing who married fred Koehler .They lived in brooklyn ,Ny York, then moved to milwaukee. They were the sponsors for my great grandparents when they came to America in 1882.My great aunt, Sister Mary Generose,S.S.N.D. used to write and sometimes see, her cousins, Henry and Marion Koehler.Do those names ring a bell? I'll have to try the Milwaukee board to see if anything turns up that I can give you.