  John McTaggart Ellis McTaggart, henceforth simply “McTaggart”, was one of the most important systematic metaphysicians of the early 20th century. His greatest work is The Nature of Existence, the first volume of which was published in 1921 while the second volume was published posthumously in 1927 with C.D. Broad as the editor of the manuscript. In addition, he authored many important articles on metaphysics, including his famous “The Unreality of Time” in 1908, some of which are collected in his Philosophical Studies (1934). 