Employee is employed to serve as a part‑time Research & Development Advisor and shall perform such duties as Mast’s Chief Executive Officer, or his designee, assigns from time to time.  Employee acknowledges that he reports to Mast’s Chief Executive Officer who will be Employee’s supervisor.  As part of Employee’s duties, Employee acknowledges and understands that: (a) Employee will devote his utmost knowledge and best skill to the performance of his duties; and (b) Employee shall devote sufficient time to complete the duties of this position, subject to absences for temporary illness.