Question: When did Bernard Tschumi's father die?
Sentence (from "Jean Tschumi"): A member of the Modern Movement, Jean Tschumi is known for his buildings for Sandoz (laboratory, factory), Nestlé (pavilions at various international fairs, headquarters), la Mutuelle Vaudoise (headquarters), as well as for some of his projects (underground Paris souterrain, observation tower, etc.).
Relevant evidence: No