Hederén was born in Stockholm, Sweden, the son of Anton Hederén, an engineer, and his wife Agnes Ohlsson. He passed "studentexamen" in 1928 and became "fänrik" in the South Scanian Infantry Regiment (I 7) in 1931. Hederén was a teacher at the Swedish Infantry Combat School from 1936 to 1939 and attended the Royal Swedish Army Staff College from 1940 to 1942 and was again a teacher at the Infantry Combat School from 1942 to 1946. He became major in the staff of the I Military Area in 1949 and served in the British Army in 1951 and in 1952. Hederén served in the Jämtland Ranger Regiment (I 5) in 1953 and was promoted to lieutenant colonel there in 1957. In 1958 Hederén served in the French Army and in 1959 he served at the Army Staff. Hederén was appointed Inspector of the Infantry in the Army Staff in 1959. Beside his military career, Hederén was also chairman of the I 5's Shooting Association ("I 5:s skytteförening") from 1954 to 1959, secretary in the Swedish Shooting Sport Federation from 1945 to 1947 and Secretary General of the 1947 ISSF World Shooting Championships. He was also a board member of Jämtland County Shooting Association from 1954 to 1959, Swedish Military Sports Federation in 1958 and of the International Modern Pentathlon Union in 1960.