As Chairman of MBLM, John has worked with First Republic Bank, Crane Corporation, American Airlines, Nokia Technologies and PJT Partners—a new company that evolved from The Blackstone Group.

John has unmatched experience in leading two of the largest branding firms in the world, Landor Associates and FutureBrand, which he founded under the name Diefenbach/Elkins. Additionally, he played a major role in launching Wolff Olins in the United States and participated in the sale of the company to Omnicom Group.

A branding luminary, John has worked across the world and has a particular passion for brands in which national cultures are involved. His clients have included Wells Fargo Bank, Disney, Hyatt Hotels, British Airways, Lufthansa, South African Airways, Kodak, Mercedes Benz, Disney, Coca-Cola, and the Alfred Nobel Foundation.