Mass. Gen. Laws ch. 146, § 14

Every insurance company, or a reinsurer, authorized to insure boilers and pressure vessels in the commonwealth and making inspections of such boilers and pressure vessels, shall have in its employ at least one inspector who holds a certificate of competency under section sixty-two and who resides in the commonwealth. When an inspector holding such a certificate ceases to be employed by an insurance company, it shall notify the state fire marshal, giving the reasons therefor.