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.
Om Prakash (historian) Om Prakash (born January 1940, in Delhi) is an Indian economic historian. He is noted for his work on the Dutch East India company in Bengal, and also for his work on coinage, precious metal trade, and other aspects of pre-colonial commerce between Europe and India. In 2005, he was knighted by the Dutch queen.