Exhibit 7
POWER OF ATTORNEY
KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes and appoints Mary Ann
Sigler as the undersigned’s true and lawful attorney-in-fact, with full power of substitution, for
and in the name, place and stead of the undersigned, in any and all capacities, to:
1) prepare, execute in the undersigned’s name and on the undersigned’s behalf, and submit to
the U.S. Securities and Exchange Commission (the “SEC”) a Form ID, including amendments
thereto, and any other documents necessary or appropriate to obtain codes and passwords enabling
the undersigned to make electronic filings with the SEC of reports required by Section 16(a) of the
Securities Exchange Act of 1934 or any rule or regulation of the SEC;
2) prepare and execute for and on behalf of the undersigned Forms 3, 4, and 5 in accordance
with Section 16(a) of the Securities Exchange Act of 1934 and the rules thereunder, including any
joint filing agreement thereunder, and do and perform any and all acts for and on behalf of the
undersigned which may be necessary or desirable to complete and execute any such Form 3, 4, or 5,
or complete and execute any amendment or amendments thereto;
3) prepare and execute for and on behalf of the undersigned reports of ownership on Schedule
13D or 13G under the Securities Exchange Act of 1934 and the rules thereunder, including any joint
filing agreement thereunder, and do and perform any and all acts for and on behalf of the
undersigned which may be necessary or desirable to complete and execute any such reports or
schedules, and complete and execute any amendment or amendments thereto; and
4) timely file such forms with the SEC and any stock exchange or similar authority, and to
take any other action of any type whatsoever in connection with the foregoing which, in the opinion
of such attorney-in-fact, may be of benefit to, in the best interest of, or legally required by,
the undersigned, it being understood that the documents executed by such attorney-in-fact on behalf
of the undersigned pursuant to this Power of Attorney shall be in such form and shall contain such
terms and conditions as such attorney-in-fact may approve in such attorney-in-fact’s discretion.
The undersigned hereby grants to such attorney-in-fact full power and authority to do and
perform each and every act and thing requisite and necessary to be done in and about the premises,
as fully to all intents and purposes as she might or could do in person, hereby ratifying and
confirming all that said attorney-in-fact, or her substitute or substitutes, may lawfully do or
cause to be done by virtue hereof.
IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of
this 10th day of July, 2009.
