He went on his first expedition in 1902–1904, known as The Danish Literary Expedition, with Jørgen Brønlund, Harald Moltke and Ludvig Mylius-Erichsen, to examine Inuit culture.
After returning home he went on a lecture circuit and wrote The People of the Polar North (1908), a combination travel journal and scholarly account of Inuit folklore.
In 1908, he married Dagmar Andersen.

In 1910, Rasmussen and friend Peter Freuchen established the Thule Trading Station at Cape York (Qaanaaq), Greenland, as a trading base.
The name Thule was chosen because it was the most northerly trading post in the world, literally the "Ultima Thule".
Thule Trading Station became the home base for a series of seven expeditions, known as the Thule Expeditions, between 1912 and 1933.
He went on his first expedition in 1902–1904, known as The Danish Literary Expedition, with Jørgen Brønlund, Harald Moltke and Ludvig Mylius-Erichsen, to examine Inuit culture. After returning home he went on a lecture circuit and wrote The People of the Polar North (1908), a combination travel journal and scholarly account of Inuit folklore. In 1908, he married Dagmar Andersen.
In 1910, Rasmussen and friend Peter Freuchen established the Thule Trading Station at Cape York (Qaanaaq), Greenland, as a trading base. The name Thule was chosen because it was the most northerly trading post in the world, literally the "Ultima Thule". Thule Trading Station became the home base for a series of seven expeditions, known as the Thule Expeditions, between 1912 and 1933.
Knud Rasmussen