Harald August Bohr (22 April 1887 – 22 January 1951) was a Danish mathematician and footballer. After receiving his doctorate in 1910, Bohr became an eminent mathematician, founding the field of almost periodic functions. His brother was the Nobel Prizewinning physicist Niels Bohr. He was on the Denmark national team for the 1908 Summer Olympics, where he won a silver medal.^{[2]}
Harald Bohr  

Born  Harald August Bohr 22 April 1887^{[1]} Copenhagen, Denmark^{[1]}  
Died  22 January 1951 Gentofte, Denmark  (aged 63)
Resting place  Assistens Cemetery, Copenhagen  
Nationality  Danish  
Alma mater  University of Copenhagen  
Occupation  Mathematician  
Parent(s)  Christian and Ellen Bohr^{[1]}  
Relatives  Niels Bohr (brother)  

Bohr was born in 1887 to Christian Bohr, a professor of physiology, from a Lutheran background, and Ellen Adler Bohr, a woman from a wealthy Jewish family of local renown.^{[3]} Harald had a close relationship with his elder brother, which The Times likened to that between Captain Cuttle and Captain Bunsby in Charles Dickens' Dombey and Son.^{[4]}
Like his father and brother before him, in 1904 Bohr enrolled at the University of Copenhagen, where he studied mathematics, obtaining his master's degree in 1909 and his doctorate a year later. Among his tutors were Hieronymus Georg Zeuthen and Thorvald N. Thiele.^{[5]} Bohr worked in mathematical analysis; much of his early work was devoted to Dirichlet series including his doctorate, which was entitled Bidrag til de Dirichletske Rækkers Theori (Contributions to the Theory of Dirichlet Series).^{[6]} A collaboration with Göttingenbased Edmund Landau resulted in the Bohr–Landau theorem, regarding the distribution of zeroes in zeta functions.^{[3]}
Bohr worked in mathematical analysis, founding the field of almost periodic functions, and worked with the Cambridge mathematician G. H. Hardy.
In 1915, he became a professor at Polyteknisk Læreanstalt (today Technical University of Denmark), working there until 1930, when he took a professorship at the University of Copenhagen. He remained in this post for 21 years until his death in 1951. Børge Jessen was one of his students there.
He was a visiting professor at Stanford University during the academic year 1930–1931.^{[7]} He was a visiting scholar at the Institute for Advanced Study in the summer of 1948.^{[8]}
Bohr was elected to the American Philosophical Society in 1945.^{[9]}
In the 1930s Bohr was a leading critic of the antiSemitic policies taking root in the German mathematical establishment, publishing an article criticising Ludwig Bieberbach's ideas in Berlingske Aften in 1934.^{[10]}
Bohr was also an excellent football player. He had a long playing career with Akademisk Boldklub, making his debut as a 16yearold in 1903.^{[11]} During the 1905 season he played alongside his brother Niels, who was a goalkeeper. Harald was selected to play for the Denmark national team in the 1908 Summer Olympics, where football was an official event for the first time. Though a Danish side had played at the 1906 Intercalated Games, the opening match of the 1908 Olympic tournament was Denmark's first official international football match. Bohr scored two goals as Denmark beat the French "B" team 9–0.^{[12]} In the next match, the semifinal, Bohr played in a 17–1 win against France, which remains an Olympic record.^{[13]} Denmark faced hosts Great Britain in the final, but lost 2–0, and Bohr won a silver medal.^{[3]}^{[6]} After the Olympics he made one further appearance for the national team, in a 2–1 victory against an England amateur team in 1910.^{[14]} His popularity as a footballer was such that when he defended his doctoral thesis the audience was reported as having more football fans than mathematicians.^{[15]}
Bohr was known as an extremely capable academic teacher and the annual award for outstanding teaching at the University of Copenhagen is called the Harald, in honour of Harald Bohr. With Johannes Mollerup, Bohr wrote an influential fourvolume textbook Lærebog i Matematisk Analyse (Textbook in mathematical analysis).^{[16]}
Following the murder of Kaj Munk on 4 January 1944 the Danish resistance newspaper De frie Danske brought condemning reactions from influential Scandinavians, including Bohr.^{[17]}
Meddelelsen om denne nye Voldsdaad i Danmark, Mordet paa en af vore største Digtere og modigste Personligheder, har opfyldt os alle med Afsky og Forfærdelse, og vi forstaar, at Kaj Munks Anseelse og den Beundring man nærede for ham her i Sverige, var saa stor, at vore Følelser deles af det svenske Folk