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.
Teresa Dent Teresa Ogilvy Dent CBE (b. 1959) is the CEO of Game & Wildlife Conservation Trust, a British charitable organisation promoting game and wildlife management as an essential part of nature conservation.