Securities and Exchange Commission 100 F Street, N.E. Judiciary Plaza Washington, DC 20549 Ladies and Gentlemen: I hereby authorize 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 Inc. This authorization shall remain in effect as long as I am an officer of DowDuPont Inc. unless it is earlier specifically revoked by me. Very truly yours, /s/ Stacy L. Fox Stacy L. Fox General Counsel and Secretary September 5, 2017 Date