May Sinclair was the pseudonym of Mary Amelia St. Clair (1863 - 1946), a popular British writer who wrote about two dozen novels, short stories and poetry. She was an active suffragist, and member of the Woman Writers' Suffrage League. She was also a significant critic, in the area of modernist poetry and prose; the literary term 'stream of consciousness' is attributed to her. She was born in Rock Ferry, Cheshire. Her father was a Liverpool shipowner, who went bankrupt, became an alcoholic, and died before she was an adult. Her mother was strict and religious; the family moved to Ilford on the edge of London. After one year of education at Cheltenham Ladies College, she acted as carer for her brothers (four of five, all older and all suffering from a fatal congenital heart disease). From 1896 she wrote professionally, to support herself and her mother, who died in 1901. She treated a number of themes relating to the position of women, and marriage. She also wrote non-fiction based on studies of philosophy, particularly German idealism. Her works sold well in the United States. Around 1913, at the Medico-Psychological Clinic in London, she became interested in psychoanalytic thought, and introduced matter related to Sigmund Freud's teaching in her novels. In 1914 she volunteered for ambulance duty in Belgium, at the start of World War I. She was able to endure only a few weeks at the front; she wrote about the experience in both prose and poetry. She wrote early criticism on Imagism and the poet H. D. (1915 in The Egoist); she was on social terms with H. D. (Hilda Doolittle), Richard Aldington and Ezra Pound at the time. She also reviewed in a positive light the poetry of T. S. Eliot (1917 in the Little Review) and the fiction of Dorothy Richardson (1918 in The Egoist). It was in connection with Richardson that she introduced 'stream of consciousness' as a literary term, which was very generally adopted. Some aspects of Sinclair's subsequent novels have been traced as influenced by modernist techniques, particularly in the autobiographical Mary Olivier: A Life (1919). She was included in the 1925 Contact Collection of Contemporary Writers. She was a member of the Society for Psychical Research from 1914. Some supernatural fiction devices appear in her shorter fiction. From the late 1920s she was suffering from the early signs of Parkinson's disease, and ceased writing. She settled with a companion in Buckinghamshire in 1932.