Cannan worked first as a translator, and a reviewer in London publications. Many of his novels are in part autobiographical, and fit into a novel sequence the Lawrie Saga, around the character Stephen Lawrie. Samuel Butler was a major influence on his fiction. In 1914, the novelist Henry James in an article in The Times named Cannan as one of four significant up-and-coming authors, alongside D. H. Lawrence, Compton Mackenzie and Hugh Walpole. He was employed as a secretary by J. M. Barrie, working with him in their efforts against censorship of the theatre by the Lord Chamberlain. A relationship developed in 1909 between Cannan and Barrie's wife Mary, a former actress who felt neglected in her marriage. Cannan had been wooing Kathleen Bruce, who at the same time was receiving advances from the explorer Robert Falcon Scott. When Bruce decided to marry Scott, Mary Barrie's sympathy for Cannan developed a momentum of its own. Her husband sought to be reconciled, but relented and divorced her in a high-profile case, and she and Cannan were married in 1910. Cannan was caricatured as Mr. Gunn, a minor character in George Bernard Shaw's 1911 drama Fanny's First Play. During World War I he was a pacifist and then conscientious objector, and was involved in the National Council Against Conscription. He used his experiences in later novels, making the character Melian Stokes in Pugs and Peacocks a portrait of Bertrand Russell. He had known Ottoline Morrell from before the war. During it he moved in her circle, introducing her to D. H. Lawrence, and knew also Dora Carrington, Dorothy Brett and the artistMark Gertler. Cannan's book Mendel was based on Gertler's early life, and explored his relationships with C. R. W. Nevinson and Carrington. Gertler painted Gilbert Cannan and his Mill; the picture is now in the Ashmolean Museum. The mill was at Cholesbury in Buckinghamshire, where Cannan was living in 1916, and which attracted a number of his intellectual circle. The picture also shows the Cannans' two Newfoundland dogs, Sammy on the left and Luath, who was also Barrie's dog before his divorce from Mary Ansell and the inspiration for Nana, the Darling children's nurse in Peter Pan. In 1916, partly in response to the devastating effects of the war and the threat of conscription, Cannan suffered a mental breakdown, an experience which he vividly described in his book, The Release of the Soul. His marriage ended in 1918 when he had an affair with Gwen Wilson who later married Henry Mond in 1920 while Cannan was lecturing in the United States. Unconventionally, Cannan lived with Wilson and her new husband in a ménage à trois in their home, Mulberry House, in Smith Square, Westminster. After the war Cannan devoted himself to writing, translation work and travel but another mental breakdown in 1923 proved untreatable. He became a mental patient at the Priory Hospital, Roehampton. He then spent the rest of his life confined to Holloway Sanatorium near Virginia Water where he died of cancer on 30 June 1955.
Family
The poet May Wedderburn Cannan and her sister, writer Joanna Cannan, were cousins of his, daughters of the academic Charles Cannan ; as was Professor Edwin Cannan, the noted LSE economist ; Joanna's daughter Diana Pullein-Thompson was his biographer. Joanna Cannan's son, Denis Cannan also followed in his footsteps, becoming a dramatist in his own right.
