Líbero graduated with a bachelor's degree in Legal and Social Sciences from the Faculty of Law at the University of São Paulo at the age of 19.

Although he briefly practiced law, serving as an attorney for the Mato Grosso Treasury, his interest in journalism soon drew him away from the legal profession.

In 1918, at the age of 29, Líbero became director and owner of the afternoon newspaper A Gazeta, transforming it into one of the largest press organizations of its time.

To this end, he imported rotary presses from Germany, replaced the telegraph with the teletype and implemented new engraving, composition and graphic printing techniques, the first in color in Brazil.

He created a supplement especially dedicated to sports, focused on football coverage, called A Gazeta Esportiva, and was the creator of the Saint Silvester Road Race.

At the age of 29, on July 14, 1918, Cásper Líbero acquired the newspaper A Gazeta from Antônio Augusto de Covello, becoming its director and owner.

Libero modernized the newspaper by implementing new technologies, improving its distribution, and organizing it for profitability, all while promoting ethical journalism.

In 1939, Cásper Líbero inaugurated the Palácio da Imprensa to house the new facilities of A Gazeta, at Rua Conceição, 88 (current Av.

He also established the July 9 Cycling Race, in honor of the Constitutionalist Revolution of 1932, along with other events like the São Paulo Swimming Crossing on the Tietê River and the Brazilian University Games.