Simon Flexner, pupil of Weich, and James, his son, author of Doctors on Horseback, combine forces to write this extensive, judicious biography of the ""greatest statesman in the field of public health"". A gentle, genial man, Welch nonetheless lived a wholly impersonal life, self-contained, undemonstrative, having almost no close relationships. This in itself conditions his biography, which is an appraisal of the work rather than the man. Johns Hopkins took shape under him, giving him freedom for opportunity rather than wealth or fame. He towered over medicine, ""determining, creating, helping change a backward profession into a leading profession of his time"". Laboratories, clinical reform, public health -- betterment of medicine on all fronts. The worship in which he is held by the profession will stimulate wide interest in this book.