Jan Jánský

Jan Jánský (30 March 1873 in Prague,Czech Republic - 8 September 1921 in Černošice) was a neurologist and psychiatrist. He was the first to divide human blood into the four types (A, B, AB, 0) of the AB0 blood group system. His discovery saved millions of lives.
His life.
He studied medicine at Charles University in Prague. From 1899 he worked in a psychiatric clinic. He became a professor at Charles University and a doctor of medicine.
World war I.
He served as a doctor for 2 years on the front lines. After suffering a heart attack in 1916, he was dismissed from the army. After that he was in charge of the department of Neurology and Forensic Psychiatry at the Central Military Hospital in Prague.
He suffered from angina pectoris. Jánský died of Coronary artery disease.
Points of Interest.
Jánský was a promoter of blood donations. Donators of Czech Republic or Slovakia receive a medal. In 1953 he was the subject of a movie directed by Martin Frič.