Securities and Exchange Commission 100 F Street, N.E. Judiciary Plaza Washington, DC 20549 Ladies and Gentlemen: I hereby authorize Erik T. Hoover, Corporate Secretary and Associate General Counsel, 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 E. I. du Pont de Nemours and Company. This authorization shall remain in effect as long as I am an executive officer of DuPont unless it is earlier specifically revoked by me. Very truly yours, /s/ C. Marc Doyle C. Marc Doyle Executive Vice President Date: December 7, 2015