- Born in the Netherlands
- 1943: Participation in the resistance, imprisonment
- Transfer to the Berlin-Lichterfelde subcamp, forced labour as a concentration camp inmate at construction sites of the Reich capital “Germania“ and defusing bombs
- 1945: Death march from Sachsenhausen, escape
- After 1945: Returned home
- Since the 1990s: Appearances as witness
- Gerard de Ruiter died in 2014.