Exhibit 24
POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS:
That the undersigned has made, constituted and appointed, and by this instrument
does make, constitute and appoint ROBERT PIERCE, ELIZABETH SHAUGHNESSY and
CIPRIANO BEREDO, acting individually, as his true and lawful attorney, for him,
and in his name, place and stead, to affix, as attorney-in-fact, the signature
of the undersigned to any reports or filings to the Securities and Exchange
Commission on or in connection with Forms 3, 4, 5 or 144 with respect to
transactions or holdings by the undersigned in equity securities issued by OM
Group, Inc., a Delaware corporation, and to any and all amendments to such
reports, giving and granting unto each such attorney-in-fact full power and
authority to do and perform every act and thing whatsoever necessary to be done
in the premises, as fully as the undersigned might or could do if personally
present, hereby ratifying and confirming all that each such attorney-in-fact
shall lawfully do or cause to be done by virtue hereof.

This Power of Attorney shall expire on the date the undersigned is no longer
required to file Forms 3, 4, 5 or 144 reports with the Securities and Exchange
Commission with respect to holdings of and transactions in securities issued by
OM Group, Inc., unless revoked in writing prior thereto.
IN WITNESS WHEREOF, this Power of Attorney has been signed in Cleveland, Ohio,
as of the 26th day of October, 2010.




	/s/ Michael V. Johnson