As soon as he thought he was competent, Sert left his master and tried to earn a living as a professional artist.
He was soon seen as a young genius in the neighborhoods around Montparnasse.
In 1958, Sert traveled to Sweden and he had the chance to show his art at different exhibitions in Copenhagen and Oslo.
On 22 March 1964, Sert was found dead, probably due to an overdose of sleeping pills.
Two memorial exhibitions were held in Stockholm in 1964 and in Copenhagen in 1965.
In March 2015, an exhibition of Sert's work was held by Ã…mells in Stockholm.