"Sigmund Exner (also Sigmund Exner, Siegmund Exner-Ewarten, Siegmund Exner Ritter von Ewarten; 5 April 1846 – 5 February 1926) was an Austrian physiologist born in Vienna." - (en.wikipedia.org 11.03.2020)
en
(The left column lists the relations of this actor to objects in the right column. In the middle you find other actors in relation to the same objects.)