POWER OF ATTORNEY
For Executing Forms 3, 4 and 5

The undersigned hereby constitutes and appoints each of Matthew J. Cushing,
Donald L. Lancaster, and Jenna L. Burstyn, signing singly, as 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 Pegasystems Inc. (the "Company"), Forms 3, 4
and 5 (including any 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

(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 Forms 3, 4
and 5 and the timely filing of such forms with the United States Securities and
Exchange Commission (the "SEC") 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, 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 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 his or her
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 liabilities or responsibilities to
comply with Section 16 of the Exchange Act.

This Power of Attorney replaces in their entirety any and all prior powers of
attorney executed by the undersigned with respect to the subject matters set
forth herein, including any powers of attorney previously filed with the SEC,
which prior powers of attorney are hereby revoked in their entirety.  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 this 15th day of May, 2020.



Signed: /s/ Kenneth Stillwell
KENNETH STILLWELL
Chief Financial Officer, Senior Vice President