Background
He was born in Kristiania as a son of professor of medicine Julius Nicolaysen (1831–1909) and Bolette Marie Berentine Nicolaysen (1835–1922).
He was born in Kristiania as a son of professor of medicine Julius Nicolaysen (1831–1909) and Bolette Marie Berentine Nicolaysen (1835–1922).
He finished his secondary education in 1887, graduated with the candidate.jur. degree in 1893 and started working as an attorney. Later barrister. He co-founded of the company De-Number-Fa in 1912, and served as board chairman for decades.
From 1931 to 1934 he was also a board member of Lilleborg Fabriker.