Anton de Haen

Anton de Haen (December 8, 1704 – September 5, 1776) was an Austrian physician of Dutch ancestry. He studied medicine in Leiden under Hermann Boerhaave, and in 1754 went to the University of Vienna, were he became professor of medicine and head of the hospital system associated with the University.

At Vienna, Anton de Haen was an associate to Gerard van Swieten, whom he worked with in the establishment of structured medical classes. He was an advocate of post-mortem investigations, as well as maintaining detailed case histories of patients. He was one of the first physicians to make routine use of the thermometer in medicine, and perceived that temperature was a valuable indication of illness and health. His best known written work was Ratio medendi in nosocomio practico, in which 18th century Viennese hospital practices and case histories are discussed. This treatise also described one the earliest known cases of amenorrhea associated with a pituitary tumor.