[1] [2] His parents were Christian Peter Georg Kampmann, a parish priest, and Johanne Marie Schmidt.

He entered the architecture department of the Royal Danish Academy of Fine Arts in 1873 and graduated in 1882, receiving the school's prestigious small gold medal ("Lille guldmedalje") for the design of a "Swimming bath in the Italian Renaissance style".

Kampmann went on numerous study trips throughout Europe, paid for by several scholarships, including northern Italy, Greece and Sweden.

One of his more notable works is one of the culminations of the style, the Police Headquarters in Copenhagen (1918–22) (in a team with Aage Rafn, Holger Jacobsen and F. Fredriksen) was among the initiators of 1920s Nordic Classicism.

[4] He was made a Knight of the Order of the Dannebrog (1897), awarded Dannebrogsmann (1906) and the King's Medal of Merit in Gold (1900).