Brierre became the Director of École normale de Chatard of rural teachers in 1928 at age nineteen. Brierre was appointed thereafter, at 21, as Secretary of Legation in Paris where he took courses in political science. In 1931, he began studying law and completed his courses in 1935. He was head of Cultural Division of the Minister of Foreign Affairs, Director of the Tourism Bureau and then Under-Secretary of State of the Ministry of Tourism. Brierre was also member of the Government Council and was named Ambassador of Haiti to Buenos Aires. Brierre worked as a politician and diplomat. He emerged in the 1930s as a poet and militant in the backlash against the United States occupation of Haiti (1915–34). His epic verse celebrated the heroes of Haitian independence and the black race. His Black Soul (1947) and La Source (1956) are well-known Haitian examples of the poetry of négritude. In 1932, Brierre founded the newspaper "La Bataille", where its criticism against the regime of Stenio Vincent and the American occupation earned him two years of closed detention in the national penitentiary.