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.
Ralph Robins Sir Ralph Harry Robins FREng (born 16 June 1932), was the CEO of Rolls-Royce. He served 20 years on the board of Rolls-Royce, retiring in 2003 after 10 years as chairman. After retiring from Rolls-Royce, he was appointed a non-executive director of Marshall Group in 2004.