Which painter’s studio did Alexander Calder visit in 1930?

In late 1930, Alexander Calder visited the studio of the Dutch painter Piet Mondrian.1

This visit was a pivotal moment in Calder’s career; he described the experience as a "shock" that moved him toward abstract art. Inspired by Mondrian’s geometric abstractions, Calder suggested that it would be interesting to make the rectangles in Mondrian’s work oscillate, which served as a catalyst for his own experiments with motion and the eventual development of his signature mobiles.1