Born near Glasgow, Scotland, Mary Nimmo came to America with her father following the death of her mother in 1847, settling in Philadelphia. Without any apparent prior interest in art, she began her studies with neighbor Thomas Moran, a successful landscape painter, and the couple married in 1865. Trained in oils and watercolors, Mary took note of etching in the late 1870s and embraced it as her principal means of artistic expression. She completed roughly 70 landscape etchings, which included scenes of England and Scotland, as well as Long Island, New York; New Jersey, Florida and Pennsylvania. She was elected to the Society of Painter-Etchers of New York and was the only woman among the 65 original fellows of London’s Royal Society of Painter-Etchers. Her prints, included in many institutional collections, received numerous awards. She died at East Hampton, New York.