Gibb was born at 28 Greenside Street in Edinburgh, the son of Alexander Gibb, a builder. His older brother was the artistWilliam Gibb. The family moved to 5 Regent Terrace on Calton Hill in 1855. The family moved again to Mayfield Terrace in the south of the city when Robert was a teenager. He studied art at evening classes at the Board of Manufacturers in Edinburgh and at the life school of the Royal Scottish Academy, and began exhibiting at the RSA in 1867 showing an Arran landscape; this would be the first of no fewer than 143 paintings exhibited at the academy. By the end of the next decade he had begun to establish his reputation as a painter of battles. Following Comrades, his first foray into the military genre, he was elected an Associate of the Royal Scottish Academy. The theme of this painting, a group of three soldiers, one of whom has fallen in the snow, was taken from his painting showing the retreat from Moscow which was shown the following year. He was made a full member following the enormous success of his 1881 painting The Thin Red Line which was inspired by his reading of Alexander Kinglake's book The Invasion of the Crimea. Three years later came Schoolmates depicting two highland officers in the heat of battle, one falling wounded into the arms of the other. In 1895 he was appointed Principal Curator of the National Gallery of Scotland, following the death of Gourlay Steell, and served in this role until 1907. He continued painting military scenes throughout the Great War, and his last military painting Backs to the Wall appeared in 1929. Gibb was also sought after also as a portrait painter and among his subjects were Henry M. Stanley, the African explorer, the Rev. Joseph Parker, D.D., Sir Arthur Halkett, Bart., and the artist's wife, the former Margaret Shennan, second daughter of the Lord Dean of the Guild, whom he married in 1885. The artist died at his residence at 2 Bruntsfield Crescent, Edinburgh in 1932, and he was given a full military funeral with honour guard at his funeral in Warriston Cemetery in Edinburgh on 15 February. Although some claim his grave lies on a path edge south of the vaults this does not make complete sense as the family already had a burial plot in a south-west section. This was the burial place of his brother William in 1929. The lack of inscription to Robert is explained by his lack of family at the time of death.
Paintings
Head of Glen-Lester, Arran
Visit of William, Lord Russell's Family before his Execution