Mary Robinson, the sister of William Heath Robinson, was a talented calligrapher and illustrator and occasional metal sculptor. She was taught by Charles Edward Johnson (1832-1913), a member of the Royal Society of Painter in Watercolours, as was her brother Charles Robinson. She became a member of the Royal Society of Scribes and Illustrators in 1921.

Her brother William praises her skill in his autobiography, My Line of Life, 1938:
’My sister has, I believe, found a great consolation in the work that now occupies her all her lifetime. Her writing and illumination are sometimes exquisite’, pp. 164-65. Mary devoted some of her life to nursing her mother and sister.