About Us The Office of Cassandra J M Mayer is a full-service law firm specializing in various areas of law, including Probate & Estate Planning, Estate Administration, Wills, Guardianship, Adoption & Name Change, Power of Attorney, Living Wills, and other legal services. Serving Richland, Ohio and the surrounding areas. If you need legal represetation, call attorney Cassandra J M Mayer now at 419-524-2444.