After Bryn left the military, he concentrated on anthropological research. Despite his relatively advanced age, he was extremely productive and provided a number of interesting contributions to the country's anthropology, at a time when industrialization and restructuring of society had not yet made their mark on the population. Already in 1921, he had presented two remarkable works,
Selbu and
Tydal and also published the controversial article
En nordisk Cro-Magnon type, which claimed that people in
Tydal Municipality were descendants of the
Cro-Magnon. He released volume one of the uncompleted work
Anthropologia Norwegica in 1925, and
Die Somatologie der Norweger together with
Kristian Schreiner in 1929. In 1932, he published
Norwegische Samen, being one of the first to take an interest in the physical anthropology of the
Sami people. Despite not holding a
doctoral degree, Bryn was a fellow of the
learned societies Royal Norwegian Society of Sciences and Letters from 1892, and of the
Norwegian Academy of Science and Letters from 1923. From 1921 to 1922, he chaired the
Norwegian Medical Association. From 1926 to 1933, he served as
praeses of the
Royal Norwegian Society of Sciences and Letters, during which time he received an
honorary degree from
Uppsala University in 1927. Bryn initially experienced great success and influence through his earlier works; for instance, in 1920, he was referred to as "Norway's most famous anthropologist" by Kristian Emil Schreiner. At this time, Bryn was considered a well-established and fairly uncontroversial member of Norwegian academia. Norway's leading academic contemporaries on issues of genetics and heredity, such as Kristinne Bonnevie,
Otto Lous Mohr, Kristian &
Alette Schreiner belonged to his academic circle. Toward the later years of his life, the same prominent members of that society would develop a more critical attitude towards his research methods; he would become a controversial figure among anthropologists. This was due to Bryn's contributions to scientific racism; his tendency to promote unorthodox, speculative, anthropological theories from scant and inconclusive evidence. He was a close colleague of the notorious racial theorist
Hans F. K. Günther, and collaborated with
Herman Lundborg at the Swedish State Institute for Racial Biology,
Statens institut för rasbiologi. His views on race were typical of nordicist
Nordic race ideas during the
interwar period. He viewed populations from Northern and Coastal Norway as bastardized populations of Nordic;
dolichocephalic and brachycephalic; Lappish and Alpine stock. Bryn also referred to the populations of Trondheim and
Møre as "inordinately well mixed bastard populations". One of Halfdan Bryn's correspondents for a short period in the early 1920s, who would eventually become a colleague, was Norway's leading eugenicist and racial hygienicist,
Jon Alfred Mjøen. Contemporary academics such as Kristine Bonnevie and the Schreiners, viewed Mjøen as a dilettante. As Mjøen's controversial theories and related activism caused him to become ever more alienated from Norwegian academia, Bryn - whose research was relevant to Mjøen's theories - was sometimes called upon to correct Mjøen by his colleagues. Bryn, however, proved disinclined to do this, as he seemed to agree with much of Mjøen's work, and eventually allied himself with Mjøen to the exclusion of his former colleagues. He joined the
International Federation of Eugenics Organizations under Mjøen's behest, but did not take an active interest in the organization. He died in March 1933, in Trondheim (the new city name from 1931). ==References==