Harald Aars

[1] He was born in Christiania as a son of educator Jacob Jonathan Aars (1837–1908) and his wife Anna Ernesta Birch-Reichenwald (1838–1919).

He was the brother of academic Kristian Aars, a grandson of Christian Birch-Reichenwald and a great-grandson of Peter Motzfeldt.

[2] In Norway he was an assistant of Holger Sinding-Larsen from 1899 to 1901 and for the city architect of Kristiania from 1902 to 1904.

[2] He presided over the National Association of Norwegian Architects from 1918 to 1919 and Selskabet for Oslo Byes Vel from 1927 to 1937.

He also edited architectural magazines, and wrote the chapter Arkitekturen i det 19. og 20. aarhundrede in the second volume of Norges Kunsthistorie, released 1927.