Office Locations Isabell M. Mueller, Attorney at Law Milwaukee Area: 890 Elm Grove Road, Suite 202 Elm Grove, WI 53122 Phone: 414.430.1722 Fax: 262.780.4808 Located in the Village Grove building, upper level. Fond du Lac Area: 845 S. Main Street, Suite 110 Fond du Lac WI 54935 Phone: 920.960.9552