Anthony Gross was of Hungarian-Irish descent, and his sister Phyllis Isobella Pearsall later became a famous writer. Gross studied at Repton and Slade, and later at Paris and Madrid. After his marriage to French fashion artist Marcelle Florenty he went to France where he created a number of animated films, returning to Britain in 1934, where he painted and created graphics.
During World War II Gross was an Official War Artist. He painted within the Egyptian, Syrian, Palestinian, Kurdistan, Lebanese, and Mesopotamian theatres of war. He was also involved in the D-Day landing of the Allied troops on Normandy and painted beachscapes. After World War II Gross returned to London where he mainly produced lithographs. His extensive travels abroad inspired him over and over again