Ruiz Guiñazú served as both a professor and a banker before into the diplomatic service, with his roles including chief delegate to the League of Nations and ambassador to Switzerland.
[4] Having previously served as ambassador to Spain, where he had been impressed by falangism, Ruiz Guiñazú advocated both neutrality in the Second World War and Hispanidad as Foreign Minister.
[5] At the Pan-American conference held in Rio de Janeiro in January 1942, Ruiz Guiñazú pushed a pro-Axis Powers agenda by ensuring that the wording of the US-led agreement was changed from a 'commitment' to breaking off diplomatic relations with the Axis to a 'recommendation'.
[7] Ostensibly seeking a peace settlement Ruiz Guiñazú and his main advisor Mario Amadeo closely co-operated with the Axis powers, sending Juan Carlos Goyeneche to Europe as their own envoy and asking German ambassador Edmund von Thermann to forward plans for an Argentine-hosted peace summit to Joachim von Ribbentrop in which Nazi rule over Europe would be officially recognised.
Away from politics Ruiz Guiñazú was a noted historian with his 1916 book La Magistratura Indiana considered a central study of justice in Latin America under Spanish rule for many years after it was first published.