CONFIRMING STATEMENT
This Statement confirms that the undersigned has authorized and
designated each of Harry Palmin, Jason Kneeland and Donald Joseph (each an
"attorney-in-fact"), each acting singly, to execute and file or cause to be
filed on the undersigned's behalf a Form ID and all Forms 3, 4, and 5 (including
any amendments thereto) that the undersigned may be required to file with the
U.S. Securities and Exchange Commission as a result of the undersigned's
ownership of or transactions in securities of Acer Therapeutics Inc. The
undersigned hereby grants to each 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 personally present, with full power of substitution, resubstitution or
revocation, hereby ratifying and confirming all that such attorney-in-fact, or
such attorney's-in-fact 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 authority of each attorney-in-fact under this Statement shall
continue until the undersigned is no longer required to file Forms 3, 4, and 5
with regard to the undersigned's ownership of or transactions in securities of
Acer Therapeutics Inc. unless earlier revoked in writing. The undersigned
acknowledges that none of the attorneys-in-fact are assuming any of the
undersigned's responsibilities to comply with Section 16 of the Securities
Exchange Act of 1934.
This Statement revokes the authority of any person named in any prior
confirming statement relating to the undersigned's filing obligations with
respect to securities of Acer Therapeutics Inc. who is not named herein, and
this Statement replaces and supersedes any such prior confirming statement.
Signed:_/s/ Matthew Seibt______
Print Name: Matthew Seibt
Dated: 09/23/19
Matthew Seibt
Filed: 23 Sep 19, 7:29pm