During this time he became acquainted with Tristan Tzara, who introduced him to Pablo Picasso in Paris. He soon became an important dealer in Picasso prints, as well as in second-hand Picasso paintings.
While interacting during that period, he encountered Tristan Tzara, who facilitated his introduction to Pablo Picasso in Paris. Soon after, he emerged as an important seller of Picasso prints and second-hand Picasso paintings.