Recent scholarly attentions have shifted from key actors within the scientific elite and religious authorities to scientific practitioners and popularizers who used science to pursue a wide variety of cultural purposes. The Roman Catholic zoologist St. George Mivart (1827–1900) has typically been cast as a staunch anti-Darwinian ostracized by Darwin’s inner circle of scientific naturalists. Understood as a popularizer of science, his position can be re-thought. Mivart did not operate on the periphery of Victorian science. Instead, his notable contributions to the fields of zoology and anatomy and his participation in debates about the origin of the human mind, consciousness, and soul made him a central figure in the changing landscape of late-Victorian scientific culture. Through the popular periodical press and his anatomy textbook for beginners, Mivart secured a reputation as a key spokesman for science and gained authority as a leading critic of agnostic scientific naturalism.