POWER OF ATTORNEY

       The  undersigned  hereby  constitutes  and  appoints Angelo Chaclas, Erik
 Johnson,   Loretta   DiLucido,   Patricia   Halberstadt,  with  full  power  of
 substitution, as the undersigned's true and lawful attorney-in-fact to:

       (1)   prepare, execute in the undersigned's name and on the undersigned's
             behalf,  and  submit to the U.S. Securities and Exchange Commission
             (the  "SEC") a Form ID, including amendments thereto, and any other
             documents  necessary  or  appropriate to obtain codes and passwords
             enabling the undersigned to make electronic filings with the SEC of
             reports required by Section 16(a) of the Securities Exchange Act of
             1934 or any rule or regulation of the SEC;

       (2)   execute  for and on behalf of the undersigned, in the undersigned's
             capacity   as   officer   and/or  director  of  Trinseo  S.A.  (the
             "Company"),  Forms  3, 4, and 5 in accordance with Section 16(a) of
             the Securities Exchange Act of 1934 and the rules thereunder;

       (3)   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  3,  4,  or  5,  complete  and execute any
             amendment or amendments thereto, and timely file such form with the
             SEC and any stock exchange or similar authority; and

       (4)   take any other action of any type whatsoever in connection with the
             foregoing  that, 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 such
             attorney-in-fact's discretion.

       The  undersigned  hereby  grants  to such 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  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,
 nor  is  the  Company  assuming,  any  of the undersigned's responsibilities to
 comply with Section 16 of the Securities Exchange Act of 1934.

       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 attorney-in-fact.

       IN  WITNESS WHEREOF, the undersigned has caused this Power of Attorney to
 be executed as of May 1, 2020.

/s/ Andre Lanning
-------------------------
Name: Andre Lanning