Roberto Marinho developed Grupo Globo (the conglomerate of media companies consisting of O Globo, Rede Globo, Rádio Globo, Editora Globo and other subsidiaries) as Brazil's largest media group, entering radio in the 1940s and TV in the 1960s, and picking up other interests.
Roberto Marinho kehitti Organizações Globoa (O Globo, Rede Globo, Rádio Globo, Editora Globo ja muista tytäryhtiöistä koostuvaa mediakonsernia) Brasilian suurimmaksi mediakonserniksi, siirtyen radioon 1940-luvulla ja televisioon 1960-luvulla.