POWER OF ATTORNEY

POWER OF ATTORNEY


I hereby appoint Richard B. Alsop, Judith A. Witterschein,
Cara I. Londin, Mason A. Reeves, Gale Chang, 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/ Nelson Chai



Nelson Chai

State of New York
County of New York

Sworn to before me this 11

day of December, 2007.








/s/ Susan N. Vena
Notary













Susan N. Vena
Notary Public: State of New York
No. 01VE5017230
Commission Expires Aug. 30, 2009