POWER OF ATTORNEY
For Executing Forms 3, 4 and 5

Know all by these presents, that the undersigned hereby constitutes and
appoints each of Mark S. Berg, Richard P. Dealy,
Mark H. Kleinman, Margaret M. Montemayor, and Thomas J. Murphy,
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 Pioneer Natural Resources Company
(the "Company"), Form ID and Forms 3, 4 and 5 (including amendments thereto)
in accordance with Section 16(a) of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), and the rules
thereunder, and Form 144 (including amendments thereto), in accordance
with Rule 144 of the Securities Act of 1933, as amended
(the "Securities Act"), and the rules thereunder;

(2) do and perform any and all acts for and on behalf of the
undersigned that may be necessary or desirable to complete and
execute any such Form ID, Form 3, 4 or 5 or Form 144 (including
amendments thereto) and timely file that Form with the Securities and
Exchange Commission and any stock exchange, self-regulatory association
or any other authority; and

(3) take any other action of any type whatsoever in connection with
the foregoing that, in the opinion of each such attorney-in-fact,
may be of benefit to, in the best interest of, or legally required
of the undersigned, it being understood that the documents executed
by the 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 the attorney-in-fact may approve in the
attorney-in-fact's discretion.

The undersigned hereby grants to each such attorney-in-fact full power
and authority to do and perform all 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 the attorney-in-fact, or the 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, and their substitutes, 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 Section 16 of the Exchange Act or
Rule 144 of the Securities Act.

The undersigned agrees that each such attorney-in-fact may rely
entirely on information furnished orally or in writing by the
undersigned to the attorney-in-fact. The undersigned also agrees
to indemnify and hold harmless the Company and each such
attorney-in-fact against any losses, claims, damages or liabilities
(or actions in these respects) that arise out of or are based upon
any untrue statements or omissions of necessary facts in the
information provided by the undersigned to such attorney-in fact for
purposes of executing, acknowledging, delivering or filing
Form ID, Form 3, 4 or 5 or Form 144 (including amendments thereto)
and agrees to reimburse the Company and the attorney-in-fact on demand
for any legal or other expenses reasonably incurred in connection with
investigating or defending against any such loss, claim, damage,
liability or action.

This Power of Attorney shall remain in full force and effect until
the undersigned is no longer required to file Forms 3, 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 the date
written below.


/s/ A.R. Alameddine
A.R. Alameddine
January 4, 2021