His father, also a painter and engraver, was Charles Robertson and his mother was Alice Mary, the daughter of the colonist Captain William Lonsdale (1799–1864), who supervised the founding of Port Phillip, later to become the location of Melbourne in Australia.
Between 1883 and 1885, he was educated with his brothers at Charterhouse School in England, where he won the Leech Prize for drawing in 1884.
Robertson exhibited 33 artworks at the Royal Academy in London and 166 works at the Society of Painter-Etchers and Engravers.
[3] He lived in Godalming and painted and etched in the county of Surrey, including in Guildford from St Catherine's Hill (1891), Shere (1899), and Albury (1905).
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