Heftye finished his secondary education in 1878, and took a military education in the following years. From 1880 he worked in the family company Thos. Joh. Heftye & Søn, but in 1885 he returned to the military, enrolling at the Norwegian Military Academy. In 1892 he took education as a telegrapher, and started working in the NorwegianArmy engineer department instead of in the infantry. He also became involved in local politics in his native Aker municipality. He belonged to the Liberal Party, and was regarded as being on their radical wing. From 1900 to 1902 he served in Paris as military attaché of Sweden and Norway. On 9 June 1903 he was appointed as Minister of Defence as a part of the Blehr's First Cabinet. He held this position until 21 October 1903, when the cabinet fell. In the same year he was promoted to lieutenant colonel. He was assigned to work as a military consultant at the Council of State Division in Stockholm. He would provide valuable information in the buildup for the dissolution of the union between Norway and Sweden in 1905, which the Liberal Party supported. In 1905, then, he was made director of Telegrafverket, running the state monopoly on telegraph services. Telegrafverket is considered a predecessor of today's telecommunications companyTelenor. Heftye served one term in Kristianiacity council, from 1907 to 1910. On 19 March 1908, when the Knudsen's First Cabinet assumed office, he was appointed for his second term as Minister of Defence. He resigned already on 10 April the same year, because Prime MinisterGunnar Knudsen refused to seek a vote of confidence in Parliament, a form of investiture. This was a problematic question at that time, as Norway had made important steps towards parliamentarism, but not formalized the process with change of government. Former Prime Minister Christian Michelsen had asked for a vote of confidence following the 1906 general election, and survived. When he retired from politics in 1907 due to illness, Jørgen Løvland took over, but he was felled in 1908. In early 1908, the Liberal Party had evicted 24 legislators who supported Christian Michelsen and the endeavors of the Coalition Party, and hence, when Knudsen took over, he had no way of achieving a parliamentary majority. In that situation he could not expect to survive a vote of confidence. It has been said that parliamentarism works best in a two-party system, which Norway did not have at that time, and has never had since, although the Coalition Party tried to implement it. On the other hand, Knudsen and his cabinet resigned following the 1909 general election, which the Liberal Party lost. Such an action is not required by law, but if not carried through, the cabinet would most likely face a vote of no confidence. Despite the disagreement in 1908, Heftye and Knudsen were not estranged. Knudsen would later sit as Prime Minister from 1913 to 1920, and he used Heftye as an arbitrator in both the national wages board and in irregular labour conflicts. Previously, during his time as telegraph director, Heftye had started the institution of non-legal wiretapping—a method which was later used in labour conflicts. He was also an international arbitrator from 1919 to 1920 when he sat on the Slesvig Commission, preparing the partition into Northern and Southern Slesvig in 1920. Heftye was also involved in sports. He was a member of the Norwegian Olympic Committee at the 1906 and 1908 Summer Olympics. He was also Norway's member of the International Olympic Committee from 1907 to 1908. He also chaired the Landsforeningen for Reiselivet from 1912 to 1918 and the Norwegian Trekking Association from 1918 to 1921.
Death
The Dovre Railway Line was officially opened in September 1921. On 19 September 1921, tragedy struck as two trains collided right outside the Nidareid tunnel in Trondhjem. Heftye was killed together with architect Erik Glosimodt and several others.
