Of what nationality are both Dentsply Sirona and Omnicom Group?
Omnicom Group Omnicom Group, Inc. is an American global marketing and corporate communications holding company, headquartered in New York City.
Wolff Olins Wolff Olins is a brand consultancy, based in London, New York City and San Francisco. Founded in 1965, it now employs 150 designers, strategists, technologists, programme managers and educators, and has been part of the Omnicom Group since 2001.