An apprentice at the watch shop during the Nazi occupation. Eventually, he takes up residence at the Beje as well. Because German troops often seize young men in the streets and send them to work in German factories, the trip to and from work has become too dangerous. Jop begins to work with Corrie as a runner; one night, while delivering news of an imminent Gestapo raid to another safe house, Jop is caught and imprisoned.