Any and all notices and other communications required or permitted herein shall be in writing and deemed delivered if delivered personally, or sent by recognized overnight courier or registered or certified mail to the Company at its principal place of business, or to the Executive at the address hereinafter set forth following the Executive's signature, or at such other address or addresses as either party may hereafter designate in writing to the other, except that such notice of change of address will only be effective upon receipt.