James Campbell Todd

James Campbell Todd was an American physician, pathologist, and medical writer born in 1874 and died in 1928. His work centered on clinical diagnosis and laboratory methods, and he taught pathology at Denver and Gross College of Medicine, part of the University of Denver. He also served as a pathologist and clinical microscopist for several Denver hospitals.

Todd is best remembered for A Manual of Clinical Diagnosis and Clinical Diagnosis by Laboratory Methods. First published in the early 20th century, these books were written to give students and practicing physicians a clear, usable guide to laboratory testing and the interpretation of results. Their long publishing history suggests how influential they became in clinical pathology.

He died at his home in Boulder, Colorado, on January 6, 1928, after a long illness. Although he is not widely known outside medical history today, his writing helped shape a more systematic, evidence-based approach to diagnosis.