EX-24.4

Exhibit 24.4

POWER OF ATTORNEY

KNOW ALL BY THESE PRESENTS that the undersigned, RODERICK D. GILLUM, hereby constitutes and appoints each of MICHAEL A. WEILAND, AMY E. SZOSTAK, CRAIG R. CARBERRY, BOLA M. BEARD and JUDY A. CARON of The Northern Trust Company, and JAMES A. CASEY and PHILIP J. NIEHOFF of Mayer Brown LLP, as his true and lawful attorneys-in-fact to:

(1)

execute for and on behalf of the undersigned all Schedules and other statements and amendments thereto required to be filed under Sections 13(d) and 13(g) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and the rules thereunder;

(2)

execute for and on behalf of the undersigned Forms 3, 4 and 5 required to be filed under Section 16(a) of the Exchange Act and the rules thereunder;

(3)

do and perform any and all acts for and on behalf of the undersigned which may be necessary or desirable to complete the execution of any such Schedule or Form referred to above and the timely filing of such Schedule or Form with the United States Securities and Exchange Commission (“SEC”) and any other authority; and

(4)

take any other action of any type whatsoever in connection with the foregoing which, in the opinion of such an 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 his or her discretion.

The powers granted above may be exercised by such attorneys-in-fact on behalf of the undersigned individually or on behalf of the undersigned in any fiduciary or representative capacity in which the undersigned may be acting.

The powers granted above may be exercised by any one of such attorneys-in-fact acting alone.

The undersigned grants to each such attorney-in-fact full power and authority to do and perform each and every act and thing whatsoever requisite, necessary and proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as such attorney-in-fact might or could do if personally present, with full power of substitution or revocation, hereby ratifying and confirming all that such attorney-in-fact, or his or her substitute or substitutes, shall lawfully do or cause to be done by virtue hereof, including but not limited to any filing with the SEC of any Schedule or Form referred to above and any agreement to file a single Schedule 13D or 13G in accordance with Regulation § 240.13d-1(k). The undersigned acknowledges that the foregoing attorneys-in-fact, in serving in such capacity at the request of the undersigned, are not assuming any of the undersigned’s responsibilities to comply with Sections 13 and 16 of the Exchange Act.

This Power of Attorney shall be effective on the date set forth below and shall continue in full force and effect as long as the undersigned shall be subject to Sections 13 or 16 of the Exchange Act and the rules thereunder or until such earlier date on which written notification executed by the undersigned is filed with the SEC expressly revoking this Power of Attorney. This Power of Attorney shall expressly revoke that certain Power of Attorney executed by me on September 27, 2017 with respect to the subject matter hereof.


STATE OF MICHIGAN		)
		)
COUNTY OF CALHOUN		)