In Tel Aviv, they formed an artists' cooperative called HaTomer that included the painter Yitzhak Frenkel.

[2] In Paris, Constant frequented the district of Montparnasse, a favorite milieu of Russian Jewish artists.

In his own words, it happened "un peu par hasard et pour gagner quelque argent" (a little bit by chance and to earn a little money).

In 1933, he published Les Traqués, a tragic story of Jews travelling across Europe in search of a safe haven.

In 1936, he won the Prix des Deux Magots for his collection of short stories Étrange famille (Strange family).

In 1959, he wrote his last novel Ailleurs, autrefois, a semi-autobiographical work in which he evoked his childhood and youth in Ukraine at the turn of the century.