Nielsen Media Research is a world-famous television ratings company. In the United States, Nielsen Media Research provides television audience estimates for broadcast and cable networks, television stations, national syndicates, regional cable television systems, satellite providers, advertisers and advertising agencies. Active in more than 40 countries, it also offers radio audience measurement, print readership and custom media research services. Nielsen Media Research, a subsidiary of Cognizant Corporation, has its headquarters in New York City and offices in major markets throughout the United States and Canada, including one in Hollywood, Calif.