He replaces Helen Overmyer who resigned several weeks ago after a tumultuous period with the agency, which included its loss of the US$1.09 million metropolitan TV ratings measurement account. Nielsen is also set to lose the lucrative pay-TV ratings contract to OzTAM, and the regional TV ratings contract. Cornelius starts next month."We fully intend to play a significant role in media research in Australia in the years ahead and Peter's appointment further underlines our commitment to our business and the industry in Australia, said Forrest Didier, managing director Nielsen Media Research Asia Pacific.