Oskar Mulley was born on the 22nd of April 1891 in Klagenfurt. After studying in Munich in 1909, the artist studied at the Vienna Academy of Fine Arts under Alois Delug and Rudolf Jettmar. From 1918 to 1934 he lived and worked in Kufstein / Tirol, an area which should determine most of his lifework. Later, he settled in Garmisch-Partenkirchen. In 1937 he received the Austrian Golden State Medal.
After his time at the academy, his works were marked by topographically accurate landscapes, rural interiors, and still lives. In his large-scale, somewhat pathetic acting paintings he showed various elements of the high mountains. In which mountain farms, chapels, and similar fortified defy the geographical circumstances and have the same artistic means of generating power and depth. He increased those monumental effects by using a wide spatula technique and a thick impasto. Oskar Mulley died on the 15th of January 1949 in Garmisch-Partenkirchen.