Notices and all other communications provided for in the Plan shall be in writing and shall be deemed to have been duly given when delivered or mailed by United States registered or certified mail, return receipt requested, postage prepaid, addressed to the last known residence address of the Participant or in the case of the Company, to its Chief Executive Officer (or in the case of notice from the Chief Executive Officer, to the Chair of the Compensation Committee of the Board of Directors), or to such other address as either party may have furnished to the other in writing in accordance herewith, except that notice of change of address shall be effective only upon receipt.