Gruner was born in Gisborne, New Zealand, but immigrated with his family to Sydney in 1883. He was a gifted artist, attending the Julian Ashton School from the age of twelve. From 1901 he exhibited with the Society of Artists and by 1914 was an assistant at Ashton’s school. Encouraged by painters such as Harley Griffith and Lambert, his fascination with the light of the Australian landscape was evident in expansive, pastoral scenes. From 1923 to 1925 he travelled through Europe and was influenced by English Post-Impressionism, adopting a higher point of view and shallower picture plane in his compositions.
Gruner maintained a successful career throughout his life, receiving a major commission from the National Art Gallery of New South Wales in 1919. The National Gallery also curated an exhibition of his work in 1925. His work is held in the Art Gallery of New South Wales, Sydney and National Gallery of Victoria, Melbourne.

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