Nicolaus Steno (1638–1686) was a renowned anatomist in his lifetime. He reformed the anatomical understanding of glands, argued that the heart was a muscle, renamed the so-called female testicles as ovaries, and developed a mathematical model for understanding muscle contraction—discoveries that were fundamental to the fields of anatomy and physiology. However, other aspects of Steno’s life have come to define him: his claim that mountains’ strata reveal the history of the Earth and his conversion to Catholicism as a practicing scientist. This excessive attention to his geological discoveries and to asking whether science and religion are compatible, Nuno Castel-Branco argues, has obscured his significant accomplishments as an anatomist. The Traveling Anatomist thus restores Steno to his rightful place as a crucial figure in early modern science.