Simon Flexner portrays William Henry Welch as probably the biggest contributor in helping establish the backbone for medicine / pathology as we know it today. Simon Flexner was a very good friend of Welch's, and this source is one of the best secondary sources available to explore what is basically a patriotic American who helped his country in every single way (including the war) but did not get the fame or credit he deserved because to achieve all that this man had, he could not afford to concentrate on any one topic. This is a book which has enabled me to access what his most intermediate friends described him as, and not only was it a good source, but also an excellent read. If you want to know why American medicine really reached its pinnacle, this book is the answer.