Guardian Service Industries is a family-owned facilities management company established in 1918 that provides janitorial, security, engineering, and other services to over 1,000 clients across the Northeast. It employs over 1,000 staff who maintain over 110 million square feet of commercial, government, residential, and other facilities. The company specializes in customized facility services and has expertise in areas like janitorial, security, pest control, lighting, and restoration.