Fr Matthew Dallman is an Episcopal priest in the Diocese of Springfield (USA). He heads up Akenside Press, an imprint devoted to Anglicanism's Catholic heritage. Particular emphasis is placed on the writings of Martin Thornton (1915-1986), a priest of the Church of England perhaps best known for English Spirituality. Thornton's writings can be considered a ressourcement, a return to the Catholic wellsprings of Anglican theology and spirituality. Dallman has condensed these sources into a very useful diagram reproduced above. Below can be found some explanatory material on the chart taken from the Akenside website.