Born in Oprișeni, in Austrian-ruled Bukovina, his uncle was Romanian Orthodox metropolitan Eugenie Hacman, while his father Vasile served as the village priest from 1857 to 1879.
He was one of fourteen founders and five editors of the pro-union organ Glasul Bucovinei, led by Sextil Pușcariu, and co-signed a programmatic article that appeared in the first number on October 22, 1918.
Joining the Romanian National Council, he attended the general congress of Bukovina and, on November 28, voted for union with Romania.
[2] During this period, in his personal papers, he expressed discontent with the heavy-handed approach toward administrative standardization being taken by the central authorities in Bucharest.
He objected to the nomination of German speaker Eugen Ehrlich as law professor, claiming this would "profoundly disparage" the university's "prestige, autonomy and national character".
His role in integrating new professors did not account for the university's traditions, and, as his interests dictated, was carried out using both old Austrian legislation and Romanian law, which had not yet been extended to the province.
[6] In 1940, during the Soviet occupation of Bukovina, Hacman fled into unoccupied Romania with his papers, which eventually ended up at the Iași chapter of the National Archives.
In autumn, he obtained approval from Education Minister Traian Brăileanu, himself a Bukovina refugee, for himself and his former colleagues to transfer to the law faculty of the University of Bucharest.
After Romania regained control of Northern Bukovina in 1941, he returned there and held numerous conferences under the cultural society's auspices.