POWER OF ATTORNEY

I, Thomas Maheras, do hereby nominate, constitute and appoint each of Michael S. Helfer,
Shelley J. Dropkin, Glenn S. Gray and Joseph B. Wollard as my true and lawful attorneys-in-fact
and agents, to act in my name, place and stead, to perform any and all acts and things and to
execute any and all instruments and documents on my behalf in connection with the filings to be
made with the Securities and Exchange Commission pursuant to Section 16 of the Securities
Exchange Act of 1934, as amended, and the rules and regulations promulgated thereunder,
including but not limited to the preparation and filing of Forms 3, 4 and 5 and any amendments
thereto, as they relate to my beneficial ownership of Citigroup Inc. securities, and to execute and
deliver any other documents or reports as may be necessary in connection therewith.

I hereby give and grant to the above-named attorneys-in-fact full power and authority to
undertake any and all actions deemed necessary, proper or convenient in connection with the
above-stated reporting requirements as fully as I might or could do if personally present to
execute and deliver such documents.

I hereby consent to, ratify and confirm all that the said attorneys-in-fact shall do or cause to be
done by virtue of this Power of Attorney.  This Power of Attorney shall remain in full force and
effect from this date forward until revoked or modified by me.  This Power of Attorney shall not
be affected by the subsequent disability or incompetence of the principal.  I hereby revoke any
prior Powers of Attorney relating to the foregoing acts.

IN WITNESS WHEREOF, I have hereunto signed my name this 2nd day of February, 2007.



	Thomas Maheras


STATE OF NEW YORK
				ss.:
COUNTY OF NEW YORK

On the 2nd day of February, 2007 before me personally came Thomas Maheras to me known to
be the individual described in and who executed the foregoing instrument, and acknowledged
that he executed the same.


Lesley B.Glazer-Pomeranz
Notary Public



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