[3][4] However, Rubenson and Aas themselves believed that Graham, Boss, and Kaufmann had reached the same point on Kabru in 1883, an opinion shared with most contemporary climbers and supported by recent analysis.

[5] He co-founded the Norwegian mountaineering club Norsk Tindeklub in 1908, together with Alf Bryn, Ferdinand Schjelderup, Henning Tønsberg and others.

On 1 August Rubenson, Bryn and Schjelderup made the first ascent of Svolværgeita, on the Lofoten island of Austvågøy.

This route includes a famous diagonal traverse across the north wall of the mountain, which was led by Rubenson.

[7] On 3 August 1910 the same group climbed Trakta on Northern Austvågøy, a mountain considered among the hardest summits to reach in Norway.