Career
In 1906 he made several first ascents in Jotunheimen, together with Ferdinand Schjelderup and Agnes Jachelln. In 1907 he reached a record height of 7,270 m at the Himalayan mountain Kabru, together with Ingvald Monrad Aas, the highest altitude anybody had reached until then He co-founded the Norwegian mountaineering club Norsk Tindeklub in 1908, together with Alf Bryn, Ferdinand Schjelderup, Henning Tønsberg and others
He made the first ascent of the Norwegian mountain Stetind in 1910, together with Alf Bonnevie Bryn and Ferdinand Schjelderup.
This was the first of a number of first ascents to follow the next two weeks in Northern Norway. On 1 August Rubenson, Bryn and Schjelderup made the first ascent of Svolværgeita, on the Lofoten island of Austvågøy.
Their route is called 1910 Ruta, or in English: The 1910 Route. This route includes a famous diagonal traverse across the north wall of the mountain, which was led by Rubinson.
On 3 August 1910 the same group climbed Trakta on Northern Austvågøy, a mountain considered among the hardest summits to reach in Norway.
Also this was a first ascent, where they climbed the main summit (Vestre Trakta) via the Northwest Ridge. Rubenson was part of the group that first attempted a winter ascent of Store Skagastølstind, but this attempt failed because of harsh snow conditions and risk of avalanches. Among Rubenson"s books are Fjeldsport før og nu and Medical telt og husbaat i Kashmir, both from 1923.
He was awarded honorary membership of both the British Alpine Club and Norsk Tindeklub.