A colorist of the School of Berlin, his preferred subject were interiors of architecturally remarkable buildings such as the Alhambra, Alcazar in Sevilla, Spain, and others. In these, he showed a keen understanding of specific architectural features, while creating a poetic atmosphere through the application of color and light.
The artist born in 1846, lived in Berlin and found the support of several monarchs, including Wilhelm I and Wilhelm II. He was the recipient of numerous awards: Vienna 1873, Philadelphia 1876, Melbourne 1889, and Berlin 1891.
Koerner died in Berlin in 1927.Source