This Agreement is binding upon and shall inure to the benefit of the parties hereto and their respective heirs, personal representatives, successors and assigns; provided, however, that Employee shall not be entitled to assign his interest in this Agreement (except for an assignment by operation of law to his estate), or any portion hereof, or any rights hereunder, to any party. Any attempted assignment by Employee in violation of this Paragraph 16 shall be null, void, ab initio and of no effect of any kind or nature whatsoever.