Professors of the Medical Faculty at the Royal Hungarian University of Science in 1863. In 1851 Ignaz Semmelweis became a senior physician in the department of obstetrics at Rókus hospital in Pest. Later, in 1855, he began teaching as a Professor of Obstetrics at the University of Pest and simultaneously led the Obstetrics Clinic at Újvilág Street. (Ignaz Semmelweis is fourth from left, top row.)