In addition to the novelist and short story writer William Boyd (1952- ), there are several other authors with the same name: a medical writer, a writer about education, a writer about hockey towns (shown on book cover as Bill Boyd), a philosophy writer, and a writer about World War I. It is not clear whether he is the author of "Protobiography," as it is not listed on his web site.
1) Boyd, William, 1952- wrote Any human heart. He wrote the foreword to Great Poets....
2) Boyd, William, 1885-1979 wrote Boyd's Introduction to the study of disease.
3) Boyd, William, 1874-1962 wrote The educational theory of Jean Jacques Rousseau.