Sir Geoffrey Langdon Keynes was a British surgeon and author. He began his career as a physician in World War I, before becoming a doctor at St Bartholomew's Hospital in London, where he made notable innovations in the fields of blood transfusion and breast cancer surgery. Keynes was also a publishing scholar and bibliographer of English literature and English medical history, focusing primarily on William Blake and William Harvey.

William Blake was an English poet, painter, and printmaker. Largely unrecognised during his life, Blake is now considered a seminal figure in the history of the poetry and visual art of the Romantic Age. What he called his "prophetic works" were said by 20th-century critic Northrop Frye to form "what is in proportion to its merits the least read body of poetry in the English language". While he lived in London his entire life, except for three years spent in Felpham, he produced a diverse and symbolically rich collection of works, which embraced the imagination as "the body of God", or "human existence itself".