INSIDER TRADING POLICY
POWER OF ATTORNEY

    The undersigned hereby constitutes and appoints each of A.
Wade Pursell, David W. Copeland and Andrew T. Fiske the
undersigned's true and lawful attorney-in-fact to:

    (1)    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;

    (2)    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 Form 3, 4 or 5 and the timely filing
of such form with the United States Securities and Exchange
Commission and any other 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.

    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 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 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 any of the undersigned's
responsibilities to comply with Section 16 of the Securities
Exchange Act of 1934.  This Power of Attorney hereby revokes all
prior existing Powers of Attorney executed by the undersigned
and related to Forms 3, 4 and 5 promulgated pursuant to Section
16(c) of the Securities Exchange Act of 1934.  This Power of
Attorney can only be revoked by delivering a signed, original
Revocation of Power of Attorney to the attorney-in-fact.

    IN WITNESS WHEREOF, the undersigned has caused this Power
of Attorney to be executed as of this 18th day of September,
2019.


    /s/ Loren M. Leiker