EXHIBIT 24
POWER OF ATTORNEY
KNOW ALL MEN BY THESE PRESENTS THAT each of the undersigned directors and officers of McKesson Corporation, a Delaware corporation (the “Company”), does hereby constitute and appoint Jeffrey C. Campbell, Laureen E. Seeger and Willie C. Bogan his or her true and lawful attorney and agent, each with full power and authority (acting alone and without the other) to execute in the name and on behalf of the undersigned as such director and/or officer, under the Securities Exchange Act of 1934, as amended, an Annual Report on Form 10-K for the fiscal year ended March 31, 2010, and thereafter to execute and file any and all amendments to such Form . Each of the undersigned hereby grants unto such attorneys and agents, and each of them, full power of substitution or resubstitution and revocation in the premises and hereby ratifies and confirms all that such attorneys and agents may do or cause to be done by virtue of these presents.
/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, Director | David M. Lawrence, Director | |
/s/ Jeffrey C. Campbell | /s/ Edward A. Mueller | |
Jeffrey C. Campbell, Executive Vice President | Edward A. Mueller, Director | |
and Chief Financial Officer | ||
(Principal Financial Officer) | ||
/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 Accounting Officer) | |
(Principal Executive 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: April 21, 2010