Robert Benjamin Stein Form 4 AGENUS / Robert Benjamin Stein ownership change

POWER OF ATTORNEY
For Executing Forms 3, 4 and 5

    Know all by these presents, that the undersigned hereby constitutes and appoints each of Garo H. Armen, Christine Klaskin, Karen Valentine, and Evan Kearns, signing singly, his/her true and lawful attorney-in-fact to:
    (1)    execute for and on behalf of the undersigned Forms 3, 4 and 5 in accordance with Section16(a) of the Securities Exchange Act of 1934 and the rules thereunder, and any other forms or reports the undersigned may be required to file, in connection with the undersigned's ownership, acquisition, or disposition of securities of Agenus Inc., a Delaware corporation;
    (2)    do and perform any and all acts for and on behalf of the undersigned which may be necessary or desirable to complete the execution of any such Form3, 4 and 5, or other form or report, complete and execute any amendment or amendments thereto, and the timely filing of such form with the United States Securities and Exchange Commission and any other authority; and
    (3)    take any other action of any type whatsoever in connection with the foregoing which, in the opinion of such attorney-in-fact, may be of benefit to, in the best interest of, or legally required by, the undersigned, it being understood that the documents executed by such attorney-in-fact on behalf of the undersigned pursuant to this Power of Attorney shall be in such form and shall contain such terms and conditions as such attorney-in-fact may approve in his/her discretion.
    The undersigned hereby grants to each such attorney-in-fact full power and authority to do and perform all and every act and thing whatsoever requisite, necessary and proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as such attorney-in-fact might or could do if personally present, with full power of substitution or revocation, hereby ratifying and confirming all that such attorney-in-fact, or his/her substitute or substitutes, shall lawfully do or cause to be done by virtue of this power of attorney and the rights and powers herein granted.  The undersigned acknowledges that the foregoing attorneys-in-fact, in serving in such capacity at the request of the undersigned, are not assuming any of the undersigned's responsibilities to comply with Section16 of the Securities Exchange Act of 1934.
      This Power of Attorney shall remain in full force and effect until the undersigned is no longer required to file Forms 3, 4, and 5 with respect to the undersigned's holdings of and transactions in securities issued by the Company, unless earlier revoked by the undersigned in a signed writing delivered to the foregoing attorneys-in-fact.
    IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this __24___ day of __June_____ 2015.


/s/ Robert B. Stein                        Print Name:    Robert B. Stein
               Signature