In the 1950s Gross began to make more bronze sculptures alongside his wood and stone pieces, and in 1957 and 1959 he traveled to Rome to work with famed bronze foundries including the Nicci foundry. At the end of the decade Gross was working primarily in bronze, which allowed him to create open forms, large-scale works and of course, multiple casts. Gross's large-scale bronze "The Family", donated to New York City in 1991 in honor of Mayor Ed Koch, and installed at the Bleecker Street Park at 11th street, is now a fixture of Greenwich Village.