He grew up with his two brothers, Axel Nielsen (1902–1970) and Povl Erik Nielsen (1909–1995) in Glostrup, 10 kilometres west of Copenhagen.
Nielsen ratings | Leslie Nielsen | Nielsen SoundScan | Nielsen Media Research | Brigitte Nielsen | Nielsen | Beth Nielsen Chapman | Axel Springer AG | Asta Nielsen | Teresa Nielsen Hayden | Nielsen Broadcast Data Systems | Kay Nielsen | Axel Wenner-Gren | Axel Scheffler | Axel Oxenstierna | Axel Munthe | Axel Heiberg Island | Juanita Nielsen | Jim Nielsen | Jerri Nielsen | Jakob Nielsen (usability consultant) | Jakob Nielsen | Brian Nielsen | Axel Schulz | Axel Milberg | Sanna Nielsen | Rick Nielsen | Nielsen Ratings | Nielsen BookScan | Michael Nielsen |