<< One of my German ancestors participated in the building of the Reformed
Church in Schoharie, NY now known as the Old Stone Fort. The names of the
those who were involved in the construction were carved in the foundation
stones. Some of them, including my ancestor William Dietz, have the letters
BM after there name. I am trying to determin what that means in this case. >>

How about Brickmaker?
Steve M.