Bohr was born in Copenhagen, Denmark, on 7 October 1885, the second of three children of Christian Bohr,[3][4] a professor of physiology at the University of Copenhagen, and Ellen Adler Bohr, who came from a wealthy Danish Jewish family prominent in banking and parliamentary circles.[5] He had an elder sister, Jenny, and a younger brother Harald.[3] Jenny became a teacher,[4] while Harald became a mathematician and Olympic footballer who played for the Danish national team at the 1908 Summer Olympics in London. Bohr was a passionate footballer as well, and the two brothers played several matches for the Copenhagen-based Akademisk Boldklub (Academic Football Club), with Bohr as goalkeeper.[6]