Except as provided in any signed written agreement contemporaneously or hereafter executed by Company and Executive, this Agreement constitutes the entire agreement of the parties with regard to the subject matter hereof, and contains all the covenants, promises, representations, warranties and agreements between the parties with respect to employment of Executive by Company.  Without limiting the scope of the preceding sentence, all individual employment, severance, and change in control agreements between the parties preceding the date of execution of this Agreement and relating to the subject matter hereof are hereby null and void and of no further force and effect.  Any modification of this Agreement will be effective only if it is in writing and signed by the party to be charged.