Arthur C. Nielsen Jr, whose family name became synonymous with the television ratings system, died on Monday in the Chicago suburb where he’d lived most of his life. He succumbed to Parkinson’s disease. He was 92. Nielsen went to work for the company his father founded in 1923 and transformed it into an international leader in market research. He became president of the A.C. Nielsen Company in 1957 and its chairman in 1975. He presided over the company’s growth from a modest operation, generating less than $4 million a year in revenue, to one with revenue of more than $680 million that expanded into New Media. The New York Times has a detailed obit.