1865 entered University of Utrecht to study physics

1869-graduated PH.d at University of Zurich appointed assistant to Kundt

1874-qualified as a lecturer at Strasberg University

1875-appinted professor in the Academy of Argiculure

1876-returned to Strasberg as a professor of physics

1870-first work was published dealing with specific heats of gases

1895- studying phenomana accompanying the passage of an electric current through a gas of extremely low pressure