Mason married Warwood Mason, a sea captain, in 1930. They had two children; a son, Jonathan "Jo" Mason (1933-1958), and a daughter
Emily Mason (1932–2019), who also became an abstract painter. Alice Trumbull Mason took up poetry and corresponded with
Gertrude Stein before resuming her painting in 1934. serving as treasurer, secretary, and then president. She took part in a MoMA demonstration. In the 1940s she began working at the
Atelier 17 where she created etchings and woodcuts. Mason's first solo exhibition of her work in New York was in 1942 at The Museum of Living Art. Mason exhibited widely over the next few decades in group exhibitions. Many subsequent solo-exhibitions would follow, including Rose Fried Gallery (Pinacotheca) in 1949 and 1951, and Firehouse Gallery, Nassau Community College in 1957. After the death of her son in 1958, Mason struggled with depression and alcoholism. During one stay at a rehabilitation clinic, she met and befriended
Richard ("Dick") Bellamy, who would later exhibit her at Hansa Gallery in 1959. Mason painted her last work in 1969. ==Death and legacy==