AmerisourceBergen Corporation Power of Attorney for Executing Forms 3, 4 and 5 Know all men by these presents, that the undersigned director of AmerisourceBergen Corporation (the "Company") hereby constitutes and appoints each of Elizabeth S. Campbell, Kourosh Q. Pirouz and any Chief Legal Officer, Secretary or Assistant Secretary of the Company, signing singly, the undersigned's true and lawful attorney-in-fact to: (I) execute for and on behalf of the undersigned, in the undersigned's capacity as a director of the Company, Forms 3, 4, and 5 in accordance with Section 16(a) of the Securities Exchange Act of 1934 and the rules thereunder; (2) do and perform any and all acts for and on behalf of the undersigned which may be necessary or desirable to complete and execute any such Form 3, 4 or 5 and timely file such form with the United States Securities and Exchange Commission (the "SEC") and any stock exchange or similar authority; (3) to request electronic filing codes from the SEC by filing the Form ID (including amendments thereto) and any other documents necessary or appropriate to obtain codes and passwords enabling the undersigned to file such reports electronically; (4) to prepare, file, and submit any documents or reports that may be required under SEC Rule 144 to permit the undersigned to sell Company common stock without registration under the Securities Act of 1933 in reliance on Rule 144 as amended from time to time; and (5) 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 such attorney-in-fact's discretion. The undersigned hereby grants to each such attorney-in-fact full power and authority to do and perform any and every act and thing whatsoever requisite, necessary, or proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned might or could do if personally present, with foll power of substitution or revocation, hereby rati fying and confirming all that such attorney-in-fact, or such attorney-in-fact's substitute or substitutes, shall lawfully do or cause to be done by vi 1 tue of th.is 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, nor is the Company assuming, any of the undersigned's responsibilities to comply with Section 16 of the Securities Exchange Act of 1934 or the Securities Act of 1933.

GOCHNAUER RICHARD W 4