He was born in Cochin, Kerala. 1910 He came to Bombay. After his graduation from the Madras School, he worked in his brother's photographic studio, Madras. 1914-19 During the First World War, because of his part-German descent, Müller was asked by the British Govt. in India either to remain interned or to join the volunteer reserve force. He joined the reserve force and won admiration for his lively sketches and drawings. 1922 Accepted Maharaja of Bikaner's assignment. Recorded hunting trips of the Maharaja. After 1928 employed as a court Artist of the Maharaja of Jodhpur.

Muller's paintings are fine examples of painting in the academic realistic style. His paintings depicts Indian draperies and local background, his figures are tall and well built, like Greaco - Roman figures. The paintings were usually done with transparent watercolour