This Agreement, together with the PIIA, the Amended and Restated 2015 Stock Plan and the Stock Option Agreement, will constitute the entire agreement of the parties with regard to the subject matter hereof, and will contain all the covenants, promises, representations, warranties and agreements between the parties with respect to employment of Executive by the Company.  Without limiting the scope of the preceding sentence, all understandings and agreements preceding the date of execution of this Agreement and relating to the subject matter hereof are as of the Effective Date superseded by this Agreement and null and void and of no further force and effect.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.