Any notice required or permitted to be given under this Agreement shall be sufficient if in writing and if personally delivered or sent by registered or certified United States mail or by a nationally recognized overnight courier service, to the Employee's residence or the last address the Employee has provided in writing to the Employers, in the case of the Employee, or to its principal office in the case of an Employer. For purposes of this Agreement, notices shall be deemed given when received at the address or office specified in the preceding sentence.