Gross was born at Dulwich, London, son of the Hungarian cartographer and founder of Geographia Ltd., Alexander Gross (1880-1958), and suffragette Isabelle Crowley (1886-1938). His sister was artist, writer and publisher Phyllis Pearsall. He attended Repton School until 1922, and from the following year studied at the Slade School of Fine Art under Henry Tonks. Later studies were at the Central School of Art and Crafts, London, the École des Beaux-Arts, Paris, and the Academia de San Fernando, Madrid. In 1925 he studied within Life classes and as an engraver at Académie Julian and Académie de la Grande Chaumière, Paris. Following study, Gross painted and produced intaglio prints in Spain, painted in Brussels, and in 1928 returned to work in Paris, and other parts of France, working entirely from life. While in France he developed a working relationship with Józef Hecht and Stanley William Hayter. During the early 1930s he exhibited in Paris galleries, becoming a member of the La Jeune Gravure Contemporaine, designed costumes and settings for ballet, and worked on animated films for photographer Courtland Hector Hoppin and composer Tibor Harsányi. Returning to England in 1934, Gross worked on animated films, illustrated a 1929 edition of Jean Cocteau’s Les Enfants Terribles and became an art director for London Films. In 1937 he returned to work in Paris, returning again to London at the outbreak of the Second World War. [ Through advocacy by Eric Kennington to the War Artists' Advisory Scheme, Gross was offered, and accepted, the role of an official war artist, and produced etchings and oil and watercolour paintings of English coastal defences and troop training. In 1941, with a temporary commission of captain, Gross was attached to the 9th Army and painted within the Egyptian, Syrian, Palestinian, Kurdistan, Lebanese, and Mesopotamian theatres of war, sometimes accompanied by other war artists Edward Ardizzone and Edward Bawden, and later documenting the 8th Army’s North African Campaign. From 1943 he transferred to India and Burma to witness the front line battle against the Japanese; these works were the subject of a one-man exhibition at the National Gallery when he returned to England. Gross accompanied the D-Day invasion of Northern France, painting the beachhead landings and the devastation of Bayeux and Caen, and followed the Allied armies into Paris and then into Germany. Gross was, at the time, one of the many war artists who painted a portrait of General Montgomery. Gross had married Villeneuve fashion artist Marcelle Marguerite Florenty in 1930; their children were Mary (b. 1935) and Jean-Pierre (b. 1937). In 1940 he brought his family from France to England, to live at Flamstead, Hertfordshire. [Following the war, Gross returned to working in London, in Chelsea, Greenwich and Blackheath, while in the mid-1950s working partly in Le Boulvé. He produced lithographs for J. Lyons and Co., and illustrated editions of Wuthering Heights and The Forsyte Saga. From 1948 to 1954 he was a life drawing tutor at Central School at Arts and Crafts, afterwards becoming Head of Printing at the Slade School of Fine Art. From 1948 to 1971 Gross’s work was exhibited in London and New York in one-man shows and as part of The London Group. In 1965 he became the first president of the Printmakers Council. He became an honorary member of the Royal Society of Painter-Etchers and Engravers in 1979, the same year being elected as an Associate of the Royal Academy; becoming a Senior Academician in 1981, and receiving an CBE in 1982. In 1965-66 Gross was a Minneapolis School of Art visiting professor.