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Jansson took the bronze medal behind Emil Zátopek and Reinaldo Gorno at the 1952 Oympic Games in Helsinki in 2:26:07 and was 5th in the Europeans in 1954. He was 2nd at Kosice in 1950 and 1954 and Swedish champion at marathon each year 1951-3 and at 25k 1950-3. His fastest time was 2:21:40 for 6th in Boston in 1955 but that was on a short course (41.1km).
With thanks to Athletics International