In 1949 Gross sketched Chaim Weizmann, President of Israel, at several functions in New York City where Weizmann was speaking. Gross began a portrait in clay and then traveled to Israel in the summer of that year hoping to be able to meet Weizmann and have him sit for a portrait. Weizmann was too ill, but Gross completed the bust in bronze later that year. Gross returned to Israel for three months in 1951 (the second of many trips there in the postwar years) to paint a series of 40 watercolors of life in various cities. This series was exhibited at the Jewish Museum (Manhattan) in 1953.