The Hanover Insurance Group, Inc. is a holding company that engages in the provision of property and casualty products and services. It operates through the following segments: Core Commercial, Specialty, Personal Lines and Other. The Core Commercial segment includes commercial multiple peril, commercial automobile, workers compensation and other core commercial coverage, such as general liability, commercial umbrella and monoline property. The Specialty focuses on Professional and Executive Lines, Specialty Property & Casualty, Marine, Surety and Other. The Personal Lines segment involves personal automobile, homeowners and other personal coverage. The Other segment operates through Opus Investment Management, Inc. The company was founded in 1852 and is headquartered in Worcester, MA.