Exhibit 24.1
POWER OF ATTORNEY
KNOW ALL PERSONS BY THESE PRESENTS, that each of the undersigned directors and officers of McKesson Corporation, a Delaware corporation, does hereby constitute and appoint Laureen E. Seeger and Willie C. Bogan such undersigned’s true and lawful attorney-in-fact and agent, with full power of substitution and resubstitution, for such undersigned and in his or her name, place and stead, in any and all capacities, to sign a registration statement on Form S-3 and any and all amendments (including post-effective amendments) to such registration statement (and any registration statement pursuant to Rule 462 under the Securities Act of 1933), and to file the same, with all exhibits thereto, and other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in connection therewith, as fully to all intents and purposes as such undersigned might or could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents, or either of them, or their or his or her substitutes or substitute, may lawfully do or cause to be done by virtue hereof. This Power of Attorney may be signed in several counterparts.
/s/ Andy D. Bryant | /s/ Marie L. Knowles | |||
Andy D. Bryant, Director | Marie L. Knowles, Director | |||
/s/ Wayne A. Budd | /s/ David M. Lawrence | |||
Wayne A. Budd, Esq., Director | David M. Lawrence, M.D., Director | |||
/s/ Jeffrey C. Campbell | /s/ Edward A. Mueller | |||
Jeffrey C. Campbell, Executive Vice President and Chief Financial Officer (Principal Financial Officer) | Edward A. Mueller, Director | |||
/s/ John H. Hammergren | /s/ Nigel A. Rees | |||
John H. Hammergren, Chairman of the Board, | Nigel A. Rees, Vice President and Controller | |||
President and Chief Executive Officer (Principal Executive Officer) | (Principal Accounting Officer) | |||
/s/ Alton F. Irby | /s/ Jane E. Shaw | |||
Alton F. Irby III, Director | Jane E. Shaw, Director | |||
/s/ M. Christine Jacobs | ||||
M. Christine Jacobs, Director |
Dated: January 25, 2012