Hemmer was born in
Vaasa, Finland, into a wealthy family. His father was Bror Balder Hemmer, a court assessor and bank manager, and his mother was Emilia Finnilä. He married Saga Margareta Söderman. Hemmer completed his
matriculation exam in 1912 and earned a Bachelor of Philosophy degree in 1917. He served as the secretary of the Finnish Swedish Writers' Association from 1920 to 1924. Hemmer received several literary awards, including the State Literary Prize in 1919, 1920, 1924, 1926, 1928, 1929, and 1934, the SLS Society Prize in 1938, the Lybeck Prize in 1926 and 1935, and the Boisman Prize in 1937. His first collection of poems,
Rösterna (The Voices), was published in 1914. He made his breakthrough in 1922 with another collection of epic poetry called
Rågens rike (Realm of the Rye). He received
The Great Nordic Novel Prize (Stora Nordiska Romanpriset) for
En man och hans samvete (A Fool of Faith), a book about the
Finnish Civil War, published in 1931. Hemmer was among the contributors to
Garm, a Swedish language satirical and political magazine based in Helsinki. Following the murder of
Kaj Munk on 4 January 1944, the Danish resistance newspaper
De frie Danske published condemning reactions from influential Scandinavians, including Hemmer. == Works ==