Kitty Wilmer O’Brien, Irish oil and watercolour landscape artist, is born in India on August 7, 1910.

Wilmer is born to Major Harold Gordon Wilmer and Alice Violet McEntire. Her father is killed at Gallipoli when she is four years old. She has a younger brother, Harold, who follows in the family military tradition and is killed in 1942. She learns her skills in the Royal Hibernian Academy (RHA) schools in Dublin, starting in 1926, where she wins a number of awards for her art. She is trained by Lilian Davidson who is working out of her studio in Earlsfort Terrace in Dublin. She wins the Taylor Scholarship in 1933 which sends her to the Slade School of Fine Art in London.

In 1936, Wilmer marries Dr. Brendan O’Brien, a Dublin surgeon and son of Dermod O’Brien. She and her husband settle in Dublin after working abroad for a few years. They have two sons, Dermod and Anthony, who is also an artist. Another artistic relative is Geraldine O’Brien.

In the period from the 1940s and 1950s O’Brien exhibits in Dublin with Brigid Ganly, RHA, her sister-in-law, as well as submitting works to the Society of Dublin Painters, the Royal Hibernian Academy and the Water Colour Society of Ireland. She exhibits annually in the Irish Living Art Exhibition and the Oireachtas Art Exhibition. O’Brien is elected a member of the Royal Hibernian Academy in 1976. She is president of the Water Colour Society of Ireland from 1962 to 1981.

O’Brien dies in Dublin in 1982.