EX-24 2 poa062020oshaughnessyfiled.htm POWER OF ATTORNEY

     Know all by these presents, that the undersigned hereby constitutes and appoints each of
Barry R. Goldman, Senior Vice President and General Counsel, Lisa Wyn, Senior Vice President
and Controller, and Jill A. Gilmer, Vice President, Corporate Secretary, signing singly,
the undersigned's true and lawful attorney-in-fact to:

1.  execute for and on behalf of the undersigned, in the undersigned's capacity as an officer
and/or director of Acuity Brands, Inc. (the "Company"), Forms3, 4, and 5 in accordance with
Section16(a) of the Securities Exchange Act of 1934 and the rules thereunder;

2.  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 Form3, 4, or 5, complete and execute any amendment
or amendments thereto, and timely file such form with the United States Securities and Exchange
Commission and any stock exchange or similar authority; and

3.  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 each such attorney-in-fact full power and authority to do
and perform any and every act and thing whatsoever requisite, necessary, or proper to be done in
the exercise of any of the rights and powers herein granted, as fully to all intents and purposes
as the undersigned 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 such attorney-
in-fact's substitute or substitutes, shall lawfully do or cause to be done by virtue of this
power of attorney and the rights and powers herein granted.  The undersigned acknowledges that
 the foregoing attorneys-in-fact, in serving in such capacity at the request of the undersigned,
are not assuming, nor is the Company assuming, any of the undersigned's responsibilities to
comply with Section16 of the Securities Exchange Act of 1934.

     This Power of Attorney shall remain in full force and effect until the undersigned is
no longer required to file Forms3, 4, and 5 with respect to the undersigned's holdings of
and transactions in securities issued by the Company, unless earlier revoked by the
undersigned in a signed writing delivered to the foregoing attorneys-in-fact.

     IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed
as of June 26, 2020.

/s/ Laura G. O'Shaughnessy

Laura G. O'Shaughnessy
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