"The very nature of the quantum theory ... forces us to regard the space-time coordination and the claim of causality, the union of which characterizes the classical theories, as complementary but exclusive features of the description, symbolizing the idealization of observation and description, respectively."
Niels Bohr was a Danish physicist who made foundational contributions to atomic structure and quantum theory. His model of the atom and broader theoretical work transformed modern physics in the 20th century. He also founded major research institutions and mentored generations of scientists.