This stimulated a nonconformist spirit that led him to his first literary involvement, a clandestine magazine called El averno.

At University, he met Arcadio López-Casanova and, thanks to him, Ramón Piñeiro, thus involving in the centre of the Galician cultural movement against caudillo Francisco Franco.

He tried to achieve a position in Ourense, but he finally got it in Viana do Bolo, as an assistant teacher in the school "Colegio Libre Asociado".

In 1974, public examinations were held in Galicia, and Carlos achieved a position as a Spanish language teacher in a school in Cangas do Morrazo.

Carlos Casares was part of Galician political life during the years of the democratic transition to democracy after Franco's death.

He was one of the instigators of a manifest called Realidade Galega (Galician reality), whose objective was achieving a Statute of Autonomy for Galicia similar to that of Catalonia and the Basque Country.

This is why both of them were included as independents in the Spanish Socialist Workers' Party's political candidatures and became members of the first Galician Parliament in 1981.

A new institution called Consello da Cultura Galega (Galician Culture Council) was also created that year as a result of their work.

He attended PEN International congresses held in Maastrich, Toronto and Santiago de Compostela, was part of the Literarisches Kolloquium in Berlin and taught Galician language around the world, in cities like New York.

As a biographer and essayist he wrote about the life and works of Vicente Risco, Otero Pedrayo, Ramón Piñeiro, Curros Enríquez and Martín Sarmiento.

Humor, straightforwardness and clarity were the most important characteristics of his narrative and essay style when writing about issues that affect the current world.

He translated O principiño (1972) by the French Antoine de Saint-Exupéry, Os escaravellos voan á tardiña (1989) by the Swedish Maria Gripe and O vello e o mar (1998) by the American Ernest Hemingway.