1860 – Born on 21st of May in Semarang, Java, Indonesia.
1885 – He received a medical degree from the University of Utrecht, Utrecht, Netherlands.
1886 – He became a professor at the University of Leiden, Leiden, Netherlands.
1903 – He invented the first practical electrocardiogram.
1924 – He received the Nobel Prize in Medicine.
1927 – He died on the 29th of September in Leiden, Netherlands.