POWER OF ATTORNEY


I hereby appoint Richard B. Alsop, Judith A. Witterschein,
Mason A. Reeves, Ana Silva, Pia K. Thompson and Margaret E. Nelson
to act individually as my agent and attorney-in-fact for the
purpose of completing, executing and filing on my behalf with
the Securities and Exchange Commission, the New York Stock Exchange,
Inc. or any other exchange or self regulatory body, any Form 3
"Initial Statement of Beneficial Ownership of Securities", Form
4 "Statement of Changes in Beneficial Ownership of Securities",
Form 5 "Annual Statement of Beneficial Ownership of Securities",
Form 144 "Notice of Proposed Sale of Securities", or any other
similar form to report securities ownership that may, in the opinion
of any of them be necessary, with respect to any transaction in
securities of Merrill Lynch & Co., Inc.

Nothing herein shall relieve me of the responsibility for the
accuracy of the information and representations contained in any
Form 3, Form 4, Form 5, Form 144 or other similar form completed,
executed and filed pursuant to this power of attorney.

This power of attorney shall supersede all similar prior powers
of attorney and will remain effective as to the agents and
attorneys-in-fact referred to above until I revoke or amend it by
written notice to such persons.




/s/ Christopher B. Hayward
Christopher B. Hayward
State of New York
County of New York

Sworn to before me this 29th
day of May, 2007.

/s/ Cheryl D. Mason
Notary

Cheryl D. Mason
Notary Public, State of New York
No. 01MA6010663, Qualified in Queens County
Certificate Filed in New York County
Commission Expires July 20, 2010