[4] He was born in Egersund to Peter Godtfried Albert Nielsen, a customs chief officer, and Karen Andrea Coucheron Aamodt.

In 1922-31 he was employed by the Christiania Aktie Ølbryggeri Oslo's main beer brewery, where he was promoted the head distiller.

Apart from being the president of several regional and national brewer labor unions and mineral water distributors, he was also the president of the Norwegian Tennis Federation and the Oslo Tennis Club for several years.

In 1922 he was a runner-up for the mixed title of the Hotel Métropole Cup of Cannes alongside Madeline O'Neill of Great Britain but eventually lost to the French duo of Suzanne Lenglen and Jean Borotra.

[7] In 1930 he clinched the mixed doubles with his Danish partner Else Støckel of the Western Germany Championships at Krefeld by overcoming the couple of Ody Koopman and his wife.