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POWER OF ATTORNEY
For Executing Forms 3, 4 and 5
KNOW ALL BY THESE PRESENTS, that the undersigned
hereby constitutes and appoints each of Maxine L. Mauricio,
Anthony J. Guzzi, Mark A. Pompa, R. Kevin Matz, and Jarrett
R. Szeftel, signing singly, as a true and lawful attorney-
in-fact for the undersigned until such authority is
specifically revoked to:
(1) execute for and on behalf of the undersigned
Forms 3, 4 and 5, or other comparable or
replacement forms, in accordance with Section
16(a) of the Securities Exchange Act of 1934 and
the rules thereunder;
(2) 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 Form 3, 4
or 5, or amendments thereto, or other comparable
or replacement Forms under Section 16(a), and the
timely filing of such form with the United States
Securities and Exchange Commission and any other
required 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 instrument shall be in such form and shall
contain such terms and conditions as such
attorney-in-fact may approve.
The undersigned hereby grants to each such attorney-
in-fact full power and authority to perform all 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 the
undersigned could do if personally present, with full power
of substitution or revocation, hereby ratifying and
confirming all that such attorney-in-fact, or any
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 any of the undersigned?s responsibilities to
comply with Section 16 of the Securities Exchange Act of
1934.
IN WITNESS WHEREOF, the undersigned has caused this
instrument to be executed as of this 23rd day of February,
2021.
/s/ Ronald L. Johnson
Ronald L. Johnson
