He also published an edition of Ptolemy's Almagest. Heiberg was born in Denmark, the son of Johanne Henriette Jacoba (n*e Schmidt) and Emil Theodor Heiberg. Heiberg was Professor of Classical Philology at the University of Copenhagen from 1896 until 1924. Among _his_ more than 200 publications were editions of the works of Archimedes(1880 and 1912), Euclid (with Heinrich Menge) (1883--1916), Apollonius of Perga (1891--93), Serenus of Antinouplis (1896), Ptolemy (1898/1903), and Hero of Alexandria (1899). <sep>, Pronoun: his