Known to friends as Sebastian and also known as Jack Sprott.
Born at Sillwood Place, Crowborough, Sussex, to Herbert Sprott and his wife, née Mary Elizabeth Williams
School - Felsted School
Clare College where he became a member of the Cambridge Apostles
He was invalidated from serving in the military during the First World War and taught in preparatory schools
In the 1920s, he became acquainted with other members of the Bloomsbury Group
He was romantically involved with the economist John Maynard Keynes, who was at the time also seeing the ballerina Lydia Lopokova. The affair with Keynes ended after Keynes married Lopokova
After a job as a demonstrator at the Psychological Laboratory in Cambridge, he moved to the University of Nottingham, where he eventually became professor of philosophy
He died on 2 September 1971 at Langham Road, Blakeney, Norfolk