All notices under this Agreement shall be in writing and shall be deemed effective when delivered in person (with respect to the Company, to the Company's Secretary) or when mailed, if mailed by certified mail, return receipt requested. Notices mailed shall be addressed, in the case of Employee, to his last known residential address, and in the case of the Company, to its corporate headquarters, attention of the Secretary, or to such other address as Employee or the Company may designate in writing at any time or from time to time to the other party in accordance with this Section.