In 1928, he spends half a year at Sir Charles Sherrington’s laboratory at Oxford.

Ragnar Arthur Granit is born in the parish of Helsinge, Finland (which is then still located in the Russian Empire) on October 30th, 1900. He is the eldest son of the Crown forester Arthur Wilhelm Granit and his wife Albertina Helena Malmberg.

Granit matriculates at Helsingfors University in 1919, first taking up experimental psychology. He becomes Mag. Phil. in 1923.

Ragnar Granit dies in Stockholm.

The family moves to the city of Helsingfors (Helsinki) where his father opens a firm dealing with sylviculture and forest produce. Ragnar Granit goes to school at the Swedish Normallyceum, as he belongs to the Swedish population of his native country. While still at school, he takes part in Finland's War of Liberation in 1918.

He marries Baroness Marguerite (Daisy) Emma Bruun. They have one son.

Returning to Helsingfors, Granit becomes Professor of Physiology in 1935.

During the Winter War between Finland and Russia, Granit is district physician for three Swedish-speaking island parishes in the Baltic Sea, simultaneously charged with the duty as physician to the forts within this region.

After his degree in psychology, he studies medicine. He comes to the conclusion that physiology would prove a better starting point than psychology for his research in the field of vision which he has undertaken almost from the beginning of his career.

He returns to Oxford as a Fellow of the Rockefeller Foundation in 1932-1933.

He accepts the post of demonstrator (assistant) at the Physiological Institute. He takes his M.D. (Doctor of Medicine) in December 1927.

In 1940 he is called to Harvard University and to the Royal Caroline Institute of Stockholm, in the end deciding in favour of the latter. In 1946 he receives a personal research chair in Neurophysiology. He takes up investigating questions of motor control. He retires as Professor Emeritus in July, 1967.

He becomes «Docent» in Physiology in 1929 and spends the following two years as Fellow in Medical Physics at the Johnson Foundation of the University of Pennsylvania.

Ragnar Granit shares the 1967 Nobel Prize in Physiology or Medicine with Haldan K. Hartline and George Wald "for their discoveries concerning the primary physiological and chemical visual processes in the eye".