John Innes Mackintosh Stewart (30 September 1906, Edinburgh – 12 November 1994, Coulsdon) was a Scottish novelist and academic. He is equally well-known for the works of literary criticism and contemporary novels published under his real name and for the crime fiction published under the pseudonym of Michael Innes. Many devotees of the Innes books were unaware of his other "identity", and vice versa.
Stewart was the son of Elizabeth Jane (née Clark) and John Stewart of Nairn. His father was a lawyer and director of Education in the city of Edinburgh. Stewart attended Edinburgh Academy, where Robert Louis Stevenson had been a pupil for a short time, and later studied English literature at Oriel College, Oxford. In 1929 he went to Vienna to study psychoanalysis. He was lecturer in English at the University of Leeds from 1930 to 1935, and then became Jury Professor of English in the University of Adelaide, South Australia.
He returned to the United Kingdom to become Lecturer in English at the Queen's University of Belfast from 1946 to 1948. In 1949 he became a Student (equivalent of Fellow in other Oxford colleges) of Christ Church, Oxford. By the time of his retirement in 1973, he was a professor of the university.
Using the pseudonym Michael Innes, he wrote about forty crime novels between 1936 and 1986. Innes's detective novels are playfully highbrow, rich in allusions to English literature and to Renaissance art. Sinuous, flexible and effortlessly elegant, Stewart's prose is refreshingly free of all influence by Strunk & White. The somewhat ponderous writing style and analysis of character, particularly in the early novels, is frequently Henry Jamesian.The best-known of Innes's detective creations is Sir John Appleby (originally Inspector John Appleby) of Scotland Yard, who is a feature of multiple books. Other novels also feature the amateur but nonetheless effective sleuth, painter and Royal Academician, Charles Honeybath. The two detectives meet in "Appleby and Honeybath." Some of the later stories feature Appleby's son Bobby as sleuth.
Stewart also wrote studies of Rudyard Kipling, Joseph Conrad, and Thomas Hardy. His last publication was his autobiography Myself and Michael Innes (1987).
In 2007, his estate transferred all of Stewart's copyrights and other legal rights to Owatonna Media. In 2010, the last of his previously uncollected stories appeared in Appleby Talks About Crime, from the specialist mystery publisher, Crippen & Landru.