DuPont de Nemours (DD) Form 3 DowDuPont / MARILLYN A HEWSON ownership change

Securities and Exchange Commission

100 F Street, N.E.

Judiciary Plaza

Washington, DC  20549



Ladies and Gentlemen:



  I hereby authorize Stacy L. Fox, General Counsel and Corporate Secretary, or any Assistant Secretary, or their respective successors in office, to sign and file on my behalf SEC Forms 3, 4 and 5 or any other SEC forms relating to changes in beneficial ownership of securities of DowDuPont.  This authorization shall remain in effect as long as I am a director of DowDuPont unless it is earlier specifically revoked by me.



       Very truly yours,





       /s/ Marillyn A. Hewson

       Marillyn A. Hewson

            Director





       September 5, 2017

       Date