Headquartered in New York City, the ACNielsen runs a global marketing research firm  which provides marketers reliable and objective information on the impact of marketing and sales programs. Since 1939, they began their international expansion and currently operating in more than 100 countries.

Founded by Arthur C. Nielsen, Sr., in 1923 in Chicago, Illinois, the company produced one of the most popular creation which called as the Nielsen Ratings. It measures television, radio and newspaper audiences in their respective media markets. In 1950 they began attaching recording devices to a statistical sample of about 1200 consumer television sets in the U.S. These devices used photographic film in mail-in cartridges to record the channels viewed by the consumer and thus determine audience size. Later they developed electronic methods of data collection and transmission.

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