Born in Tunuyán, where he lived until age seven, he later moved with his family to Mendoza. At the age of fourteen, he entered the Academia Nacional de Bellas Artes. At the National University of Cuyo, he studied with Lino Enea Spilimbergo. In 1953, Alonso exhibited at the Gallery Viau of Buenos Aires, then traveled to Europe where he exhibited in Paris and Madrid. In 1961 he visiting London and discovered acrylic painting techniques. His work, characterized by expressive power and social commitment, has been exhibited in numerous exhibitions, including at the Art Gallery International (Buenos Aires), where, in 1967, some 250 of his works relating to Dante Alighieri's Divine Comedy were exhibited.
In 1971, his works were exhibited in European galleries such as Villa Giulia in Rome, the Eidos of Milan, and the Bedford in London. In 2005, 400 years after Cervantes' work was published, the Museum of Design and Illustration held a tribute exhibition at Buenos Aires' Museo de Artes Plàsticas Eduardo Sìvori where Alonso's prints and original drawings were displayed.