A high school teacher from the time he was still a student, Sperantia was dispatched to the newly acquired Transylvania province in the wake of World War I, serving as director of higher education for Cluj (1919–1921), professor at the Oradea law academy (1929–1934) and professor of sociology and philosophy of law at the University of Cluj (1934–1949).
Hailed, at the same time, by Constantin Rădulescu-Motru for his contributions to philosophy and sociology, he was a professor shaped in the spirit of Titu Maiorescu's school.
His published books include collections of Symbolist poems (Zvonuri din necunoscut, 1921; Pasul umbrelor și al veciei, 1930, Romanian Writers' Society prize; Sus, 1939), a novel (Casa cu nalbă, 1916), aesthetic studies (Frumosul ca înaltă suferință, 1921; "Papillons" de Schumann, 1934, Romanian Academy prize), memoirs (Figuri universitare, 1967; Amintiri din lumea literară, 1967), short biographies of musicians, philosophical essays, studies of psychology (Psihologia gândirii, 1922) and of philosophy of law (Principii fundamentale de filosofie juridică, 1936).
[2] A member of the Romanian Writers' Society from 1916, as well as of international associations for legal philosophers and sociologists, he took part in numerous congresses abroad.
This took place after he had undergone a concerted series of attacks during the preceding several years, both from committed Bolsheviks and from the opportunists who had turned to Marxism overnight.