Isaac was the only son of an old and rich business man. When he was 19, fulfilling a childhood dream, he joined the merchant marine as a radio-telegrapher and made many trips on international routes.

In 1946 he started to visit the recently opened painting studio at the Museum of Images from the Unconscious. Isaac was always the first to arrive and would immediately look for the materials to start working on his paintings, revealing great interest and pleasure in painting, especially oil canvases.

From the beginning, his paintings already prefigured the artistic development that he would accomplish over time. Two subjects stand out among the diverse themes that appeared in his paintings: intensely colourful landscapes which tend to abstraction and the image of the beloved woman, in different forms. According to art critic Marcio Doctors, “Isaac offers us landscapes which alternate areas of calm and extensive colours with colours that precipitate into zones in which the brush is applied quickly, creating a composition that is equal to the forces of nature. Isaac’s precision is born from an inner diving.”